Security update for python311 SUSE Patch security@suse.de SUSE Security Team SUSE-SU-2026:20665-1 Final 1 1 2026-03-10T18:54:29Z current 2026-03-10T18:54:29Z 2026-03-10T18:54:29Z cve-database/bin/generate-cvrf.pl 2017-02-24T01:00:00Z Security update for python311 This update for python311 fixes the following issues: - CVE-2025-11468: preserving parens when folding comments in email headers. (bsc#1257029) - CVE-2026-0672: rejects control characters in http cookies. (bsc#1257031) - CVE-2026-0865: rejecting control characters in wsgiref.headers.Headers, which could be abused for injecting false HTTP headers. (bsc#1257042) - CVE-2025-15366: basically the same as the previous patch for IMAP protocol. (bsc#1257044) - CVE-2025-15282: basically the same as the previous patch for urllib library. (bsc#1257046) - CVE-2025-15367: basically the same as the previous patch for poplib library. (bsc#1257041) - CVE-2025-12781: fix decoding with non-standard Base64 alphabet (bsc#1257108) The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). SUSE-SLE-Micro-6.1-434 Copyright SUSE LLC under the Creative Commons License 4.0 with Attribution (CC-BY-4.0) https://www.suse.com/support/update/announcement/2026/suse-su-202620665-1/ Link for SUSE-SU-2026:20665-1 https://lists.suse.com/pipermail/sle-security-updates/2026-March/024748.html E-Mail link for SUSE-SU-2026:20665-1 https://www.suse.com/support/security/rating/ SUSE Security Ratings https://bugzilla.suse.com/1257029 SUSE Bug 1257029 https://bugzilla.suse.com/1257031 SUSE Bug 1257031 https://bugzilla.suse.com/1257041 SUSE Bug 1257041 https://bugzilla.suse.com/1257042 SUSE Bug 1257042 https://bugzilla.suse.com/1257044 SUSE Bug 1257044 https://bugzilla.suse.com/1257046 SUSE Bug 1257046 https://bugzilla.suse.com/1257108 SUSE Bug 1257108 https://www.suse.com/security/cve/CVE-2025-11468/ SUSE CVE CVE-2025-11468 page https://www.suse.com/security/cve/CVE-2025-12781/ SUSE CVE CVE-2025-12781 page https://www.suse.com/security/cve/CVE-2025-15282/ SUSE CVE CVE-2025-15282 page https://www.suse.com/security/cve/CVE-2025-15366/ SUSE CVE CVE-2025-15366 page https://www.suse.com/security/cve/CVE-2025-15367/ SUSE CVE CVE-2025-15367 page https://www.suse.com/security/cve/CVE-2026-0672/ SUSE CVE CVE-2026-0672 page https://www.suse.com/security/cve/CVE-2026-0865/ SUSE CVE CVE-2026-0865 page SUSE Linux Micro 6.1 libpython3_11-1_0-3.11.14-slfo.1.1_3.1 python311-3.11.14-slfo.1.1_3.1 python311-base-3.11.14-slfo.1.1_3.1 python311-curses-3.11.14-slfo.1.1_3.1 libpython3_11-1_0-3.11.14-slfo.1.1_3.1 as a component of SUSE Linux Micro 6.1 python311-3.11.14-slfo.1.1_3.1 as a component of SUSE Linux Micro 6.1 python311-base-3.11.14-slfo.1.1_3.1 as a component of SUSE Linux Micro 6.1 python311-curses-3.11.14-slfo.1.1_3.1 as a component of SUSE Linux Micro 6.1 When folding a long comment in an email header containing exclusively unfoldable characters, the parenthesis would not be preserved. This could be used for injecting headers into email messages where addresses are user-controlled and not sanitized. CVE-2025-11468 SUSE Linux Micro 6.1:libpython3_11-1_0-3.11.14-slfo.1.1_3.1 SUSE Linux Micro 6.1:python311-3.11.14-slfo.1.1_3.1 SUSE Linux Micro 6.1:python311-base-3.11.14-slfo.1.1_3.1 SUSE Linux Micro 6.1:python311-curses-3.11.14-slfo.1.1_3.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2026/suse-su-202620665-1/ https://www.suse.com/security/cve/CVE-2025-11468.html CVE-2025-11468 https://bugzilla.suse.com/1257029 SUSE Bug 1257029 When passing data to the b64decode(), standard_b64decode(), and urlsafe_b64decode() functions in the "base64" module the characters "+/" will always be accepted, regardless of the value of "altchars" parameter, typically used to establish an "alternative base64 alphabet" such as the URL safe alphabet. This behavior matches what is recommended in earlier base64 RFCs, but newer RFCs now recommend either dropping characters outside the specified base64 alphabet or raising an error. The old behavior has the possibility of causing data integrity issues. This behavior can only be insecure if your application uses an alternate base64 alphabet (without "+/"). If your application does not use the "altchars" parameter or the urlsafe_b64decode() function, then your application does not use an alternative base64 alphabet. The attached patches DOES NOT make the base64-decode behavior raise an error, as this would be a change in behavior and break existing programs. Instead, the patch deprecates the behavior which will be replaced with the newly recommended behavior in a future version of Python. Users are recommended to mitigate by verifying user-controlled inputs match the base64 alphabet they are expecting or verify that their application would not be affected if the b64decode() functions accepted "+" or "/" outside of altchars. CVE-2025-12781 SUSE Linux Micro 6.1:libpython3_11-1_0-3.11.14-slfo.1.1_3.1 SUSE Linux Micro 6.1:python311-3.11.14-slfo.1.1_3.1 SUSE Linux Micro 6.1:python311-base-3.11.14-slfo.1.1_3.1 SUSE Linux Micro 6.1:python311-curses-3.11.14-slfo.1.1_3.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2026/suse-su-202620665-1/ https://www.suse.com/security/cve/CVE-2025-12781.html CVE-2025-12781 https://bugzilla.suse.com/1257108 SUSE Bug 1257108 User-controlled data URLs parsed by urllib.request.DataHandler allow injecting headers through newlines in the data URL mediatype. CVE-2025-15282 SUSE Linux Micro 6.1:libpython3_11-1_0-3.11.14-slfo.1.1_3.1 SUSE Linux Micro 6.1:python311-3.11.14-slfo.1.1_3.1 SUSE Linux Micro 6.1:python311-base-3.11.14-slfo.1.1_3.1 SUSE Linux Micro 6.1:python311-curses-3.11.14-slfo.1.1_3.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2026/suse-su-202620665-1/ https://www.suse.com/security/cve/CVE-2025-15282.html CVE-2025-15282 https://bugzilla.suse.com/1257046 SUSE Bug 1257046 The imaplib module, when passed a user-controlled command, can have additional commands injected using newlines. Mitigation rejects commands containing control characters. CVE-2025-15366 SUSE Linux Micro 6.1:libpython3_11-1_0-3.11.14-slfo.1.1_3.1 SUSE Linux Micro 6.1:python311-3.11.14-slfo.1.1_3.1 SUSE Linux Micro 6.1:python311-base-3.11.14-slfo.1.1_3.1 SUSE Linux Micro 6.1:python311-curses-3.11.14-slfo.1.1_3.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2026/suse-su-202620665-1/ https://www.suse.com/security/cve/CVE-2025-15366.html CVE-2025-15366 https://bugzilla.suse.com/1257044 SUSE Bug 1257044 The poplib module, when passed a user-controlled command, can have additional commands injected using newlines. Mitigation rejects commands containing control characters. CVE-2025-15367 SUSE Linux Micro 6.1:libpython3_11-1_0-3.11.14-slfo.1.1_3.1 SUSE Linux Micro 6.1:python311-3.11.14-slfo.1.1_3.1 SUSE Linux Micro 6.1:python311-base-3.11.14-slfo.1.1_3.1 SUSE Linux Micro 6.1:python311-curses-3.11.14-slfo.1.1_3.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2026/suse-su-202620665-1/ https://www.suse.com/security/cve/CVE-2025-15367.html CVE-2025-15367 https://bugzilla.suse.com/1257041 SUSE Bug 1257041 When using http.cookies.Morsel, user-controlled cookie values and parameters can allow injecting HTTP headers into messages. Patch rejects all control characters within cookie names, values, and parameters. CVE-2026-0672 SUSE Linux Micro 6.1:libpython3_11-1_0-3.11.14-slfo.1.1_3.1 SUSE Linux Micro 6.1:python311-3.11.14-slfo.1.1_3.1 SUSE Linux Micro 6.1:python311-base-3.11.14-slfo.1.1_3.1 SUSE Linux Micro 6.1:python311-curses-3.11.14-slfo.1.1_3.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2026/suse-su-202620665-1/ https://www.suse.com/security/cve/CVE-2026-0672.html CVE-2026-0672 https://bugzilla.suse.com/1257031 SUSE Bug 1257031 User-controlled header names and values containing newlines can allow injecting HTTP headers. CVE-2026-0865 SUSE Linux Micro 6.1:libpython3_11-1_0-3.11.14-slfo.1.1_3.1 SUSE Linux Micro 6.1:python311-3.11.14-slfo.1.1_3.1 SUSE Linux Micro 6.1:python311-base-3.11.14-slfo.1.1_3.1 SUSE Linux Micro 6.1:python311-curses-3.11.14-slfo.1.1_3.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2026/suse-su-202620665-1/ https://www.suse.com/security/cve/CVE-2026-0865.html CVE-2026-0865 https://bugzilla.suse.com/1257042 SUSE Bug 1257042