openSUSE-SU-2026:21459-1: important: Security update for python313, python3

[email protected] Thu, 30 Jul 2026 17:51:42 +0200 (CEST)

Newsgroups	gmane.linux.suse.security.announce
Message-ID	<[email protected]>

openSUSE security update: security update for python313, python3
-------------------------------------------------------------

Announcement ID: openSUSE-SU-2026:21459-1
Rating: important
References:

* bsc#1211301
* bsc#1258364
* bsc#1261969
* bsc#1261970
* bsc#1262098
* bsc#1262319
* bsc#1262654
* bsc#1263787

Cross-References:

* CVE-2021-4189
* CVE-2026-1502
* CVE-2026-3446
* CVE-2026-4786
* CVE-2026-6019
* CVE-2026-6100

CVSS scores:

* CVE-2021-4189 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
* CVE-2026-1502 ( SUSE ): 4.9 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
* CVE-2026-1502 ( SUSE ): 5.7 CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
* CVE-2026-3446 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
* CVE-2026-3446 ( SUSE ): 6 CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
* CVE-2026-4786 ( SUSE ): 7.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L
* CVE-2026-4786 ( SUSE ): 7 CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
* CVE-2026-6019 ( SUSE ): 3.8 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N
* CVE-2026-6019 ( SUSE ): 2.1 CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
* CVE-2026-6100 ( SUSE ): 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
* CVE-2026-6100 ( SUSE ): 9.1 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Affected Products:

openSUSE Leap 16.0

-------------------------------------------------------------

An update that solves 6 vulnerabilities and has 8 bug fixes can now be installed.

Description:

This update for python313, python3 fixes the following issues:

Changes in python313:

Update to 3.13.14:

- Security

- gh-151159: Bumps the OpenSSL version to 3.0.21 on Android.
- gh-150599: Fix a possible stack buffer overflow in bz2 when
a bz2.BZ2Decompressor is reused after a decompression
error. The decompressor now becomes unusable after libbz2
reports an error.
- gh-149835: shutil.move() now resolves symlinks via
os.path.realpath() when checking whether the destination is
inside the source directory, preventing a symlink-based
bypass of that guard.
- gh-149698: Update bundled libexpat to version 2.8.1 for the
fix for CVE 2026-45186.
- gh-87451: The ftplib module’s undocumented ftpcp function
no longer trusts the IPv4 address value returned from the
source server in response to the PASV command by default,
completing the fix for CVE-2021-4189. As with ftplib.FTP,
the former behavior can be re-enabled by setting the
trust_server_pasv_ipv4_address attribute on the source
ftplib.FTP instance to True. Thanks to Qi Deng at Aurascape
AI for the report.
- gh-149486: tarfile.data_filter() now validates link targets
using the same normalised value that is written to disk,
strips trailing separators from the member name when
resolving a symlink’s directory, and rejects link members
that would replace the destination directory itself. This
closes several path-traversal bypasses of the data
extraction filter.
- gh-149079: Fix a potential denial of service in
unicodedata.normalize(). The canonical ordering step of
Unicode normalization used a quadratic-time insertion sort
for reordering combining characters, which could be
exploited with crafted input containing many combining
characters in non-canonical order. Replaced with
a linear-time counting sort for long runs.
- gh-149018: Improved protection against XML hash-flooding
attacks in xml.parsers.expat and xml.etree.ElementTree when
Python is compiled with libExpat 2.8.0 or later.
- gh-149017: Update bundled libexpat to version 2.8.0.
- gh-90309: Base64-encode values when embedding cookies to
JavaScript using the http.cookies.BaseCookie.js_output()
method to avoid injection and escaping. (bsc#1262654,
CVE-2026-6019)
- gh-148808: Added buffer boundary check when using nbytes
parameter with
asyncio.AbstractEventLoop.sock_recvfrom_into(). Only
relevant for Windows and the asyncio.ProactorEventLoop.
- gh-148395: Fix a dangling input pointer in
lzma.LZMADecompressor, bz2.BZ2Decompressor, and internal
zlib._ZlibDecompressor when memory allocation fails with
MemoryError, which could let a subsequent decompress() call
read or write through a stale pointer to the
already-released caller buffer. (bsc#1262098,
CVE-2026-6100, seems like it has been incompletely applied
gh#python/cpython#151605)
- gh-148169: A bypass in webbrowser allowed URLs prefixed
with %action to pass the dash-prefix safety check
(bsc#1262098, CVE-2026-6100).
- gh-146581: Fix vulnerability in shutil.unpack_archive() for
ZIP files on Windows which allowed to write files outside
of the destination tree if the patch in the archive
contains a Windows drive prefix. Now such invalid paths
will be skipped. Files containing “..” in the name (like
“foo..bar”) are no longer skipped.
- gh-146333: Fix quadratic backtracking in
configparser.RawConfigParser option parsing regexes (OPTCRE
and OPTCRE_NV). A crafted configuration line with many
whitespace characters could cause excessive CPU usage.
- gh-146211: Reject CR/LF characters in tunnel request
headers for the HTTPConnection.set_tunnel() method.
(bsc#1261969, CVE-2026-1502)
- Core and Builtins
- gh-151112: Fix a crash in the compiler that could occur
when running out of memory.
- gh-151126: Fix a crash, when there’s no memory left on
a device, which happened in:
- code compilation - _winapi.CreateProcess()
- Now these places raise proper MemoryError errors.
- gh-150633: Fix the frozen importer accepting module names
with embedded null bytes, which caused it to bypass the
sys.modules cache and create duplicate module objects.
- gh-149156: Fix an intermittent crash after os.fork() when
perf trampoline profiling is enabled and the child returns
through trampoline frames inherited from the parent
process.
- gh-149449: Fix a use-after-free crash when the unicodedata
module was removed from sys.modules and garbage-collected
between calls that decode \N{...} escapes or use the
namereplace codec error handler.
- gh-148450: Fix abc.register() so it invalidates type
version tags for registered classes.
- gh-150207: Fix a crash when a memory allocation fails
during tokenizer initialization. A proper MemoryError is
now raised instead.
- gh-150107: asyncio: sendfile() and sock_sendfile() event
loop methods now call file.seek(offset) if file has
a seek() method, even if offset is 0 (default value).
- gh-150146: Fix a crash on a complex type variable
substitution.
- from typing import TypeVar;
memoryview[TypeVar("")][*typing.Mapping[..., ...]] used to
fail due to missing NULL check on _unpack_args C function
call.
- gh-149590: Fix crash when faulthandler is imported more
than once.
- gh-149738: sqlite3: Disallow removing row_factory and
text_factory attributes of a connection to prevent a crash
on a query.
- gh-139808: Add branch protections for AArch64 (BTI/PAC) in
assembly code used by -X perf_jit (Linux perf profiler
integration).
- gh-148820: Fix a race in _PyRawMutex on the free-threaded
build where a Py_PARK_INTR return from _PySemaphore_Wait
could let the waiter destroy its semaphore before the
unlocking thread’s _PySemaphore_Wakeup completed, causing
a fatal ReleaseSemaphore error.
- gh-148653: Forbid marshalling recursive code objects which
cannot be correctly unmarshalled.
- gh-148390: Fix an undefined behavior in memoryview when
using the native boolean format (?) in cast(). Previously,
on some common platforms, calling
memoryview(b).cast("?").tolist() incorrectly returned
[False] instead of [True] for any even byte b. Patch by
Bénédikt Tran.
- gh-148418: Fix a possible reference leak in a corrupted
TYPE_CODE marshal stream.
- gh-148222: Fix vectorcall support in types.GenericAlias
when the underlying type does not support the vectorcall
protocol. Fix possible leaks in types.GenericAlias and
types.UnionType in case of memory error.
- gh-145376: Fix reference leaks in various unusual error
scenarios.

- C API

- gh-150907: Fix dynamic_annotations.h header file when built
with C++ and Valgrind: add extern "C++" scope for the C++
template. Patch by Victor Stinner.

- Build

- gh-149351: Avoid possible broken macOS framework install
names when DESTDIR is specified during builds.
- gh-146475: Block Apple Clang from being used to build the
JIT as it ships without required LLVM tools.
- gh-148535: No longer use the gcc -fprofile-update=atomic
flag on i686. The flag has been added to fix a random GCC
internal error on PGO build (gh-145801) caused by
corruption of profile data (.gcda files). The problem is
that it makes the PGO build way slower (up to 47x slower)
on i686. Since the GCC internal error was not seen on i686
so far, don’t use -fprofile-update=atomic on i686 anymore.
Patch by Victor Stinner.

- Library

- gh-150913: Fix sqlite3.Blob slice assignment to raise
TypeError and IndexError for type and size mismatches
respectively, even when the target slice is empty.
- gh-143008: Fix race conditions when re-initializing
a io.TextIOWrapper object.
- gh-150685: Update bundled pip to 26.1.2
- gh-150406: Fix a possible crash occurring during socket
module initialization when the system is out of memory on
platforms without a reentrant gethostbyname.
- gh-150372: readline: Fix a potential crash during tab
completion caused by an out-of-memory error during module
initialization.
- gh-150175: Fix race condition in
unittest.mock.ThreadingMock where concurrent calls could
lose increments to call_count and other attributes due to
a missing lock in _increment_mock_call.
- gh-84353: Preserve non-UTF-8 encoded filenames when
appending to a zipfile.ZipFile. Previously, non-ASCII names
stored in a legacy encoding (without the UTF-8 flag bit
set) could be corrupted when the central directory was
rewritten: they were decoded as cp437 and then re-stored as
UTF-8.
- gh-149995: Update various docstrings in typing.
- gh-88726: The email package now uses standard MIME charset
names “gb2312” and “big5” instead of non-standard names
“eucgb2312_cn” and “big5_tw”.
- gh-149571: Fix the C implementation of
xml.etree.ElementTree.Element.itertext(): it no longer
emits text for comments and processing instructions.
- gh-149921: Fix reference leaks in error paths of the
_interpchannels and _interpqueues extension modules.
- gh-149801: Add IANA registered names and aliases with
leading zeros before number (like IBM00858, CP00858,
IBM01140, CP01140) for corresponding codecs.
- gh-149701: Fix bad return code from Lib/venv/bin/activate
if hashing is disabled
- gh-112821: In the REPL, autocompletion might run arbitrary
code in the getter of a descriptor. If that getter raised
an exception, autocompletion would fail to present any
options for the entire object. Autocompletion now works as
expected for these objects.
- gh-149388: Make asyncio.windows_utils.PipeHandle closing
idempotent.
- gh-149489: Fix ElementTree serialization to HTML. The
content of elements “xmp”, “iframe”, “noembed”, “noframes”,
and “plaintext” is no longer escaped. The “plaintext”
element no longer have the closing tag.
- gh-149377: Update bundled pip to 26.1.1
- gh-149231: In tomllib, the number of parts in TOML keys is
now limited.
- gh-149117: Fix runpy.run_module() and runpy.run_path() to
set the name attribute on the ImportError they raise.
- gh-149148: ensurepip: Upgrade bundled pip to 26.1. This
version fixes the CVE 2026-3219 vulnerability. Patch by
Victor Stinner.
- gh-148093: Fix an out-of-bounds read of one byte in
binascii.a2b_uu(). Raise binascii.Error, instead of reading
past the buffer end.
- gh-148914: Fix memoization of in-band PickleBuffer in the
Python implementation of pickle. Previously, identical
PickleBuffers did not preserve identity, and empty writable
PickleBuffer memoized an empty bytearray object in place of
b'', so the following references to b'' were unpickled as
an empty bytearray object.
- gh-138907: Support RFC 9309 in urllib.robotparser.
- gh-148954: Fix XML injection vulnerability in
xmlrpc.client.dumps() where the methodname was not being
escaped before interpolation into the XML body.
- gh-148801: xml.etree.ElementTree: Fix a crash in
Element.__deepcopy__ on deeply nested trees.
- gh-148735: xml.etree.ElementTree: Fix a use-after-free in
Element.findtext when the element tree is mutated
concurrently during the search.
- gh-146553: Fix infinite loop in typing.get_type_hints()
when __wrapped__ forms a cycle. Patch by Shamil Abdulaev.
- gh-148508: An intermittent timing error when running SSL
tests on iOS has been resolved.
- gh-148518: If an email containing an address header that
ended in an open double quote was parsed with
a non-compat32 policy, accessing the username attribute of
the mailbox accessed through that header object would
result in an IndexError. It now correctly returns an empty
string as the result.
- gh-148370: configparser: prevent quadratic behavior when
a ParsingError is raised after a parser fails to parse
multiple lines. Patch by Bénédikt Tran.
- gh-148254: Use singular “sec” instead of “secs” in timeit
verbose output for consistency with other time units.
- gh-148192: email.generator.Generator._make_boundary could
fail to detect a duplicate boundary string if linesep was
not n. It now correctly detects boundary strings when
linesep is rn as well.
- gh-146313: Fix a deadlock in multiprocessing’s resource
tracker where the parent process could hang indefinitely in
os.waitpid() during interpreter shutdown if a child created
via os.fork() still held the resource tracker’s pipe open.
- gh-145831: Fix email.quoprimime.decode() leaving a stray \r
when eol='\r\n' by stripping the full eol string instead of
one character.
- gh-145105: Fix crash in csv reader when iterating with
a re-entrant iterator that calls next() on the same reader
from within __next__.
- gh-130750: Restore quoting of choices in argparse error
messages for improved clarity and consistency with
documentation.
- gh-105936: Attempting to mutate non-field attributes of
dataclasses with both frozen and slots being True now
raises FrozenInstanceError instead of TypeError. Their
non-dataclass subclasses can now freely mutate non-field
attributes, and the original non-slotted class can be
garbage collected. The fix also handles the case of an
empty __class__ cell on a function found within the class
(gh-148947).
- gh-142516: ssl: fix reference leaks in ssl.SSLContext
objects. Patch by Bénédikt Tran.
- gh-142831: Fix a crash in the json module where
a use-after-free could occur if the object being encoded is
modified during serialization.
- gh-140287: The asyncio REPL now handles exceptions when
executing PYTHONSTARTUP scripts. Patch by Bartosz Sławecki.
- gh-90949: Add
SetBillionLaughsAttackProtectionActivationThreshold() and
SetBillionLaughsAttackProtectionMaximumAmplification() to
xmlparser objects to tune protections against billion
laughs attacks. Patch by Bénédikt Tran.
- gh-132631: Fix “I/O operation on closed file” when parsing
JSON Lines file with JSON CLI.
- gh-128110: Fix bug in the parsing of email address headers
that could result in extraneous spaces in the decoded text
when using a modern email policy. Space between pairs of
adjacent RFC 2047 encoded-words is now ignored, per section
6.2 (and consistent with existing parsing of unstructured
headers like Subject).
- gh-107398: Fix tarfile stream mode exception when process
the file with the gzip extra field.
- gh-123853: Update the table of Windows language code
identifiers (LCIDs) used by locale.getdefaultlocale() on
Windows to protocol version 16.0 (2024-04-23).
- gh-70039: Fixed bug where smtplib.SMTP.starttls() could
fail if smtplib.SMTP.connect() is called explicitly rather
than implicitly.
- gh-83281: email: improve handling trailing garbage in
address lists to avoid throwing AttributeError in certain
edge cases
- gh-91099: imaplib.IMAP4.login() now raises exceptions with
str instead of bytes. Patch by Florian Best.
- IDLE
- bpo-6699: Warn the user if a file will be overwritten when
saving.
- Documentation
- gh-150319: Generic builtin and standard library types now
document the meaning of their type parameters.
- gh-148663: Document that calendar.IllegalMonthError is
a subclass of both ValueError and IndexError since Python
3.12.
- gh-146646: Document that glob.glob(), glob.iglob(),
pathlib.Path.glob(), and pathlib.Path.rglob() silently
suppress OSError exceptions raised from scanning the
filesystem.
- gh-109503: Fix documentation for shutil.move() on usage of
os.rename() since nonatomic move might be used even if the
files are on the same filesystem. Patch by Fang Li
- Tests
- gh-151130: Add more tests for PyWeakref_* C API.
- gh-149776: Fix test_socket on Linux kernel 7.1 and newer:
skip UDP Lite tests if it’s not supported. Patch by Victor
Stinner.

- Keep unversioned Python 3 development entry points in
python3-devel: python313-devel no longer provides python3-devel
and no longer owns libpython3.so, python3-config, python3.pc,
or python3-embed.pc. Do not package versioned GIL pkg-config
files in nogil-devel. Also, fix regular expressions in
rpmlintrc.

- Improve testing for the support of IPPROTO_UDPLITE, which could be
not present although header files are. (bsc#1263787,
gh#python/cpython!149081)

- Add missing BR `crypto-policies-scripts` (need for the fix of
bsc#1211301).

- CVE-2026-6019: protect against HTML injection by
Base64-encoding cookie values embedded in JS (bsc#1262654,
gh#python/cpython#90309)

- CVE-2026-1502: reject CR/LF in HTTP tunnel request headers
(bsc#1261969, gh#python/cpython#146211)

- CVE-2026-4786: fix webbrowser %action substitution bypass of
dash-prefix check (bsc#1262319, gh#python/cpython#148169)

- CVE-2026-6100: prevent dangling pointer, which can end in the
use-after-free error (bsc#1262098, gh#python/cpython#148395)

Changes in python3:

- Provide explicitly also file dependencies /usr/bin/python3 and
/usr/bin/pydoc3.

break bootstrap build dependency cycle on primary python

Break the cyclic build dependency loop between `python3` and
`python313` during version upgrades (such as 3.13.13 to 3.13.14).

Previously, `python3.spec` required `BuildRequires:
%{primary_python}` (the versioned non-base interpreter package)
and queried its version via `rpm -q` during spec file parsing.
During upgrades, this blocked the build of `python3` because
`%{primary_python}` (non-base) depended on `python3-base`, which
demanded the new `python313-base` version.

Since the unversioned compatibility package `python3` only
creates unversioned symlinks (like `/usr/bin/python3`) and owns
generic RPM macros, it does not actually require the versioned
standard library modules (the non-base flavor) to build.

This change allows `python3` to build successfully against the
already built `python313-base` and `python313-devel` packages,
breaking the circular dependency and enabling a clean upgrade
path.

- Let python3-devel explicitly provide pkgconfig(python3) and
pkgconfig(python3-embed), matching its ownership of the unversioned
pkg-config files.

- Complete the transition of the unversioned python3 namespace
(jsc#PED-16123, bsc#1258364).
- Add missing Provides/Obsoletes for generic names.
- Add macros.python3 (moved from python313).

- Add BuildIgnore: gdb
BuildRequires: python313-devel → python313-devel owns
/usr/share/gdb/auto-load/...libpython3.13...-gdb.py → the
currently published version of that file has #!/usr/bin/python3
→ RPM auto-generated Requires: python3-base on gdb → OBS tries
to install gdb into the build root and fails because
python3-base is the package being built.
- Correct the logic in the %pre scripts.
- version of the package must be equal to the version of
%primary_python

- Initial packaging effort for the python3 superpackage.

python3 is shipped as new package.

Patch instructions:

To install this openSUSE security update use the suse recommended installation methods
like YaST online_update or "zypper patch".
Alternatively you can run the command listed for your product:

- openSUSE Leap 16.0

zypper in -t patch openSUSE-Leap-16.0-1359=1

Package List:

- openSUSE Leap 16.0:

libpython3_13-1_0-3.13.14-160000.1.1
libpython3_13-1_0-x86-64-v3-3.13.14-160000.1.1
libpython3_13t1_0-3.13.14-160000.1.1
python3-3.13.14-160000.1.1
python3-base-3.13.14-160000.1.1
python3-curses-3.13.14-160000.1.1
python3-dbm-3.13.14-160000.1.1
python3-devel-3.13.14-160000.1.1
python3-doc-3.13.14-160000.1.1
python3-doc-devhelp-3.13.14-160000.1.1
python3-idle-3.13.14-160000.1.1
python3-testsuite-3.13.14-160000.1.1
python3-tk-3.13.14-160000.1.1
python3-tools-3.13.14-160000.1.1
python313-3.13.14-160000.1.1
python313-base-3.13.14-160000.1.1
python313-base-x86-64-v3-3.13.14-160000.1.1
python313-curses-3.13.14-160000.1.1
python313-dbm-3.13.14-160000.1.1
python313-devel-3.13.14-160000.1.1
python313-doc-3.13.14-160000.1.1
python313-doc-devhelp-3.13.14-160000.1.1
python313-idle-3.13.14-160000.1.1
python313-nogil-3.13.14-160000.1.1
python313-nogil-base-3.13.14-160000.1.1
python313-nogil-curses-3.13.14-160000.1.1
python313-nogil-dbm-3.13.14-160000.1.1
python313-nogil-devel-3.13.14-160000.1.1
python313-nogil-idle-3.13.14-160000.1.1
python313-nogil-testsuite-3.13.14-160000.1.1
python313-nogil-tk-3.13.14-160000.1.1
python313-nogil-tools-3.13.14-160000.1.1
python313-testsuite-3.13.14-160000.1.1
python313-tk-3.13.14-160000.1.1
python313-tools-3.13.14-160000.1.1
python313-x86-64-v3-3.13.14-160000.1.1

References:

* https://www.suse.com/security/cve/CVE-2021-4189.html
* https://www.suse.com/security/cve/CVE-2026-1502.html
* https://www.suse.com/security/cve/CVE-2026-3446.html
* https://www.suse.com/security/cve/CVE-2026-4786.html
* https://www.suse.com/security/cve/CVE-2026-6019.html
* https://www.suse.com/security/cve/CVE-2026-6100.html