openSUSE-SU-2026:21593-1: important: Security update for go1.26

openSUSE security update: security update for go1.26
-------------------------------------------------------------

Announcement ID: openSUSE-SU-2026:21593-1
Rating: important
References:

  * bsc#1255111
  * bsc#1266609
  * bsc#1275024
  * bsc#1275025
  * bsc#1275026
  * bsc#1275028
  * bsc#1275029
  * bsc#1275032
  * bsc#1275033
  * bsc#1275034



Cross-References:

  * CVE-2026-33818
  * CVE-2026-39821
  * CVE-2026-56853
  * CVE-2026-56858
  * CVE-2026-56859
  * CVE-2026-56860
  * CVE-2026-56862
  * CVE-2026-56864
  * CVE-2026-56865



CVSS scores:

  * CVE-2026-33818 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-39821 ( SUSE ): 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
  * CVE-2026-39821 ( SUSE ): 9.1 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-56853 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-56858 ( SUSE ): 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
  * CVE-2026-56859 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-56860 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  * CVE-2026-56862 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-56864 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
  * CVE-2026-56865 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected Products:

         openSUSE Leap 16.0

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

An update that solves 9 vulnerabilities and has 10 bug fixes can now be installed.

Description:

This update for go1.26 fixes the following issues:

Update to go1.26.6 (released 2026-08-13, bsc#1255111).

Security issues fixed:

- CVE-2026-33818: encoding/asn1: unenforced recursion limit can lead to stack exhaustion when parsing deeply-nested,
  recursive structures (bsc#1275034).
- CVE-2026-39821: golang.org/x/net/idna: failure to reject ASCII-only Punycode-encoded labels allows for validation
  bypass and privilege escalation (bsc#1266609).
- CVE-2026-56853: net/http: missing timeout when doing unencrypted HTTP/2 check can lead to a denial of service
  (bsc#1275028).
- CVE-2026-56858: html/template: improper Javascript regexp context tracking allows for XSS attacks (bsc#1275033).
- CVE-2026-56859: encoding/xml: missing recursion depth guard during decode operation can lead to stack exhaustion
  and a denial of service (bsc#1275026).
- CVE-2026-56860: net/url: quadratic time complexity in `resolvePath` when processing certain input can lead to high
  memory allocation overhead and a denial of service (bsc#1275029).
- CVE-2026-56862: crypto/tls: no limit set for handshake messages sent post-handshake allows for denial of service
  (bsc#1275032).
- CVE-2026-56864: x/mod/sumdb: unauthenticated hashes accepted in `Lookup` allows for a coordinating GOPROXY and
  GOSUMDB to serve a client malicious module content (bsc#1275025).
- CVE-2026-56865: x/mod/sumdb/tlog: improper transparency log tile verification allows for bypass on crafted input
  and can lead to malicious module content to be accepted (bsc#1275024).

Changes for go1.26.6:

- go#79876 cmd/compile: prove misscompilation in slicemask folding leaves garbage in the upper bits
- go#80099 cmd/compile: internal compiler error invalid heap allocated var without Heapaddr
- go#80131 cmd/link: peCreateExportFile generates invalid .def file when output name has trailing dot (c-shared on
  Windows)
- go#80365 os: Root's MkdirAll can't create paths ending in forward slashes
- go#80367 os: TestRootMultiReadFile fails on netbsd/arm64 after CL 797880
- go#80369 os: TestRootConsistencyRemoveAll fails on Plan 9 after CL 797880
- go#80394 runtime: arm64 found pointer to free object with safe code
- go#80441 runtime: uninitialized register due to wrong ABI in mach_vm_region_trampoline leads to libc following
  garbage stack data as a pointer
- go#80478 cmd/compile: riscv64 miscompiles struct copy, corrupting a []byte slice field
- go#80499 runtime: js/wasm: "found bad pointer in Go heap" -- link-layout-constant value recorded as a pointer in
  the write-barrier buffer
- go#80579 cmd/compile: regalloc uses unreliable type data (like v.Type.IsSigned()) to choose the restore of spills
- go#80606 crypto/tls: escape hatch for FIPS 140-3 mode Extended Master Secret enforcement
- go#80609 net, x/net/dns/dnsmessage: panic when parsing invalid SVCB record
- go#80615 cmd/compile: mips64le misscompile OffPtr by a const which doesn't fit 32bits resulting in panic
- go#80617 cmd/compile: mips/mips64, multiply/divide results spilled from HI/LO corrupted w/ big stack frames
- go#80619 cmd/compile: prove bug causes invalid indirect call
- go#80715 runtime: fpTracebackPartialExpand SIGSEGV under high panic load


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-16.0-1463=1

Package List:

- openSUSE Leap 16.0:

  go1.26-1.26.6-160000.1.1
  go1.26-doc-1.26.6-160000.1.1
  go1.26-race-1.26.6-160000.1.1

References:

  * https://www.suse.com/security/cve/CVE-2026-33818.html
  * https://www.suse.com/security/cve/CVE-2026-39821.html
  * https://www.suse.com/security/cve/CVE-2026-56853.html
  * https://www.suse.com/security/cve/CVE-2026-56858.html
  * https://www.suse.com/security/cve/CVE-2026-56859.html
  * https://www.suse.com/security/cve/CVE-2026-56860.html
  * https://www.suse.com/security/cve/CVE-2026-56862.html
  * https://www.suse.com/security/cve/CVE-2026-56864.html
  * https://www.suse.com/security/cve/CVE-2026-56865.html