Security update for python3

Announcement ID:	SUSE-SU-2026:1937-1
Release Date:	2026-05-18T07:42:02Z
Rating:	important
References:	bsc#1261969 bsc#1261970 bsc#1262098 bsc#1262319 bsc#1262654
Cross-References:	CVE-2026-1502 CVE-2026-3446 CVE-2026-4786 CVE-2026-6019 CVE-2026-6100
CVSS scores:	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-2026-1502 ( 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 ( NVD ): 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/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-2026-3446 ( SUSE ): 6.0 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-2026-3446 ( 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 ( NVD ): 6.0 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/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-2026-4786 ( SUSE ): 7.0 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-2026-4786 ( 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 ( NVD ): 7.0 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 ): 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-2026-6019 ( 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 ( NVD ): 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 ): 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 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 ( NVD ): 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/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
Affected Products:	SUSE Linux Enterprise High Performance Computing 12 SP5 SUSE Linux Enterprise Server 12 SP5 SUSE Linux Enterprise Server 12 SP5 LTSS SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security SUSE Linux Enterprise Server for SAP Applications 12 SP5

An update that solves five vulnerabilities can now be installed.

Description:

This update for python3 fixes the following issue:

• CVE-2026-1502: HTTP client proxy tunnel headers not validated for CR/LF (bsc#1261969).
• CVE-2026-3446: base64 decoding stops at first padded quad by default and ignores other information that could be processed (bsc#1261970).
• CVE-2026-4786: URLs prefixed with %action can pass the dash-prefix safety check and allow for command injection (bsc#1262319).
• CVE-2026-6019: BaseCookie.js_output() does not neutralize characters in cookie values embedded in JS (bsc#1262654).
• CVE-2026-6100: use-after-free in lzma.LZMADecompressor, bz2.BZ2Decompressor, and gzip.GzipFile when process is under memory pressure(bsc#1262098).

Patch Instructions:

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

• SUSE Linux Enterprise Server 12 SP5 LTSS
  zypper in -t patch SUSE-SLE-SERVER-12-SP5-LTSS-2026-1937=1
• SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security
  zypper in -t patch SUSE-SLE-SERVER-12-SP5-LTSS-EXTENDED-SECURITY-2026-1937=1

Package List:

• SUSE Linux Enterprise Server 12 SP5 LTSS (aarch64 ppc64le s390x x86_64)
  • python3-devel-3.4.10-25.185.1
  • python3-base-3.4.10-25.185.1
  • python3-tk-debuginfo-3.4.10-25.185.1
  • python3-3.4.10-25.185.1
  • python3-curses-3.4.10-25.185.1
  • python3-curses-debuginfo-3.4.10-25.185.1
  • python3-debuginfo-3.4.10-25.185.1
  • python3-tk-3.4.10-25.185.1
  • libpython3_4m1_0-3.4.10-25.185.1
  • python3-debugsource-3.4.10-25.185.1
  • python3-base-debugsource-3.4.10-25.185.1
  • libpython3_4m1_0-debuginfo-3.4.10-25.185.1
  • python3-base-debuginfo-3.4.10-25.185.1
• SUSE Linux Enterprise Server 12 SP5 LTSS (ppc64le s390x x86_64)
  • python3-devel-debuginfo-3.4.10-25.185.1
• SUSE Linux Enterprise Server 12 SP5 LTSS (s390x x86_64)
  • libpython3_4m1_0-debuginfo-32bit-3.4.10-25.185.1
  • libpython3_4m1_0-32bit-3.4.10-25.185.1
  • python3-base-debuginfo-32bit-3.4.10-25.185.1
• SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security (x86_64)
  • libpython3_4m1_0-32bit-3.4.10-25.185.1
  • python3-devel-3.4.10-25.185.1
  • python3-base-3.4.10-25.185.1
  • python3-tk-debuginfo-3.4.10-25.185.1
  • libpython3_4m1_0-debuginfo-32bit-3.4.10-25.185.1
  • python3-3.4.10-25.185.1
  • python3-curses-3.4.10-25.185.1
  • python3-curses-debuginfo-3.4.10-25.185.1
  • python3-debuginfo-3.4.10-25.185.1
  • libpython3_4m1_0-3.4.10-25.185.1
  • python3-base-debuginfo-32bit-3.4.10-25.185.1
  • python3-tk-3.4.10-25.185.1
  • python3-devel-debuginfo-3.4.10-25.185.1
  • python3-debugsource-3.4.10-25.185.1
  • python3-base-debugsource-3.4.10-25.185.1
  • libpython3_4m1_0-debuginfo-3.4.10-25.185.1
  • python3-base-debuginfo-3.4.10-25.185.1

References:

• 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
• https://bugzilla.suse.com/show_bug.cgi?id=1261969
• https://bugzilla.suse.com/show_bug.cgi?id=1261970
• https://bugzilla.suse.com/show_bug.cgi?id=1262098
• https://bugzilla.suse.com/show_bug.cgi?id=1262319
• https://bugzilla.suse.com/show_bug.cgi?id=1262654