SUSE-SU-2026:2923-1: moderate: Security update for gnutls

[SLE-UPDATES]

# Security update for gnutls

Announcement ID: SUSE-SU-2026:2923-1  
Release Date: 2026-07-13T17:49:40Z  
Rating: moderate  
References:

  * bsc#1263707
  * bsc#1263710
  * bsc#1263712
  * bsc#1263713
  * bsc#1263714
  * bsc#1263715

  
Cross-References:

  * CVE-2026-3833
  * CVE-2026-42011
  * CVE-2026-42013
  * CVE-2026-42014
  * CVE-2026-42015
  * CVE-2026-5260

  
CVSS scores:

  * CVE-2026-3833 ( SUSE ):  6.9
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-3833 ( SUSE ):  6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
  * CVE-2026-3833 ( NVD ):  7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
  * CVE-2026-3833 ( NVD ):  6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
  * CVE-2026-42011 ( SUSE ):  6.3
    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-42011 ( SUSE ):  4.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
  * CVE-2026-42011 ( NVD ):  7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
  * CVE-2026-42013 ( SUSE ):  8.3
    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-42013 ( SUSE ):  6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
  * CVE-2026-42013 ( NVD ):  8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
  * CVE-2026-42014 ( SUSE ):  5.1
    CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
  * CVE-2026-42014 ( SUSE ):  4.0 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  * CVE-2026-42014 ( NVD ):  6.6 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
  * CVE-2026-42015 ( SUSE ):  6.8
    CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-42015 ( SUSE ):  6.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
  * CVE-2026-42015 ( NVD ):  5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  * CVE-2026-5260 ( SUSE ):  8.2
    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-5260 ( SUSE ):  5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-5260 ( NVD ):  8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

  
Affected Products:

  * SUSE Linux Enterprise Server 12 SP5
  * SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security
  * SUSE Linux Enterprise Server for SAP Applications 12 SP5

  
  
An update that solves six vulnerabilities can now be installed.

## Description:

This update for gnutls fixes the following issues

  * CVE-2026-3833: incorrectly accepted domain names due to comparison during
    name constraints processing being case-sensitive (bsc#1263707).
  * CVE-2026-5260: heap overread when processing extremely short premaster
    secret as part of an RSA key exchange (bsc#1263715).
  * CVE-2026-42011: name constraint bypass leading to acceptance of invalid
    certificates during certificate validation (bsc#1263710).
  * CVE-2026-42013: certificate validation bypass when validating certificates
    with an oversized SAN (bsc#1263712).
  * CVE-2026-42014: use-after-free when an attacker attempts to change the PIN
    with a NULL old PIN for a token that lacks a protected authentication path
    (bsc#1263713).
  * CVE-2026-42015: memory corruption when appending to a PKCS#12 bag that
    already contains 32 elements (bsc#1263714).

## 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 Extended Security  
    zypper in -t patch SUSE-SLE-SERVER-12-SP5-LTSS-EXTENDED-SECURITY-2026-2923=1

## Package List:

  * SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security (x86_64)
    * gnutls-debugsource-3.4.17-8.26.1
    * libgnutls30-debuginfo-32bit-3.4.17-8.26.1
    * libgnutls30-3.4.17-8.26.1
    * libgnutls30-debuginfo-3.4.17-8.26.1
    * libgnutls30-32bit-3.4.17-8.26.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-3833.html
  * https://www.suse.com/security/cve/CVE-2026-42011.html
  * https://www.suse.com/security/cve/CVE-2026-42013.html
  * https://www.suse.com/security/cve/CVE-2026-42014.html
  * https://www.suse.com/security/cve/CVE-2026-42015.html
  * https://www.suse.com/security/cve/CVE-2026-5260.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1263707
  * https://bugzilla.suse.com/show_bug.cgi?id=1263710
  * https://bugzilla.suse.com/show_bug.cgi?id=1263712
  * https://bugzilla.suse.com/show_bug.cgi?id=1263713
  * https://bugzilla.suse.com/show_bug.cgi?id=1263714
  * https://bugzilla.suse.com/show_bug.cgi?id=1263715

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