openSUSE-SU-2026:21339-1: moderate: Security update for python-mistune

openSUSE security update: security update for python-mistune
-------------------------------------------------------------

Announcement ID: openSUSE-SU-2026:21339-1
Rating: moderate
References:

  * bsc#1271082
  * bsc#1271117
  * bsc#1271119
  * bsc#1271121
  * bsc#1271125
  * bsc#1271127
  * bsc#1271128
  * bsc#1271131
  * bsc#1271132



Cross-References:

  * CVE-2026-44896
  * CVE-2026-59922
  * CVE-2026-59923
  * CVE-2026-59924
  * CVE-2026-59925
  * CVE-2026-59926
  * CVE-2026-59927
  * CVE-2026-59928
  * CVE-2026-59929
  * CVE-2026-59930



CVSS scores:

  * CVE-2026-44896 ( SUSE ): 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
  * CVE-2026-44896 ( SUSE ): 5.3 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
  * CVE-2026-59922 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  * CVE-2026-59922 ( SUSE ): 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
  * CVE-2026-59923 ( SUSE ): 5.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
  * CVE-2026-59923 ( SUSE ): 5.1 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-59924 ( SUSE ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
  * CVE-2026-59924 ( SUSE ): 8.2 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-59925 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  * CVE-2026-59925 ( SUSE ): 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
  * CVE-2026-59926 ( SUSE ): 5.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
  * CVE-2026-59926 ( SUSE ): 5.1 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-59927 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  * CVE-2026-59927 ( SUSE ): 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
  * CVE-2026-59928 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  * CVE-2026-59928 ( SUSE ): 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
  * CVE-2026-59929 ( SUSE ): 5.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
  * CVE-2026-59930 ( SUSE ): 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Affected Products:

         openSUSE Leap 16.0

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

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

Description:

This update for python-mistune fixes the following issues

- CVE-2026-59922: quadratic-time parsing on long runs of some markers in `formatting.py` can lead to DoS (bsc#1271117).
- CVE-2026-59923: `HTMLRenderer.safe_url()` does not block percent-encoded javascript URIs and allows for XSS
  (bsc#1271119).
- CVE-2026-59924: improper processing of user-supplied include paths in `Include.parse()` can lead to path traversal
  and arbitrary file reads (bsc#1271121).
- CVE-2026-59925: quadratic-time parsing on long runs of some emphasis pairs in `inline_parser` can lead to DoS
  (bsc#1271125).
- CVE-2026-59926: improper escaping in `render_admonition()` can lead to atribute injection and XSS (bsc#1271127).
- CVE-2026-59927: uncontrolled recursion when processing two markdown files that include each other can lead to a DoS
   (bsc#1271128).
- CVE-2026-59928: quadratic-time parsing on long lists of repeated reference-link definitions in `block_parser` can
  lead to DoS (bsc#1271131).
- CVE-2026-59929: HARMFUL_PROTOCOLS list misses legacy and chained schemes and allow arbitrary script execution in
  user agents (bsc#1271132).
- CVE-2026-59930: the `toc` plugin and `TableOfContents` directive generate heading IDs with predictable values and
  allow for collisions with attacker-controlled `id="toc_N"` content (bsc#1271082).


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-16.0-1243=1

Package List:

- openSUSE Leap 16.0:

  python313-mistune-3.1.3-160000.5.1

References:

  * https://www.suse.com/security/cve/CVE-2026-44896.html
  * https://www.suse.com/security/cve/CVE-2026-59922.html
  * https://www.suse.com/security/cve/CVE-2026-59923.html
  * https://www.suse.com/security/cve/CVE-2026-59924.html
  * https://www.suse.com/security/cve/CVE-2026-59925.html
  * https://www.suse.com/security/cve/CVE-2026-59926.html
  * https://www.suse.com/security/cve/CVE-2026-59927.html
  * https://www.suse.com/security/cve/CVE-2026-59928.html
  * https://www.suse.com/security/cve/CVE-2026-59929.html
  * https://www.suse.com/security/cve/CVE-2026-59930.html