SUSE-SU-2026:21452-1: important: Security update for curl

[SLE-UPDATES]

# Security update for curl

Announcement ID: SUSE-SU-2026:21452-1  
Release Date: 2026-04-30T14:47:08Z  
Rating: important  
References:

  * bsc#1259362
  * bsc#1262631
  * bsc#1262632
  * bsc#1262635
  * bsc#1262636
  * bsc#1262638

  
Cross-References:

  * CVE-2026-1965
  * CVE-2026-4873
  * CVE-2026-5545
  * CVE-2026-6253
  * CVE-2026-6276
  * CVE-2026-6429

  
CVSS scores:

  * CVE-2026-1965 ( SUSE ):  6.9
    CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
  * CVE-2026-1965 ( SUSE ):  7.5 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
  * CVE-2026-1965 ( NVD ):  6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
  * CVE-2026-4873 ( SUSE ):  6.3
    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-4873 ( SUSE ):  3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
  * CVE-2026-5545 ( SUSE ):  8.3
    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-5545 ( SUSE ):  6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
  * CVE-2026-6253 ( SUSE ):  8.2
    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-6253 ( SUSE ):  5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
  * CVE-2026-6276 ( SUSE ):  6.3
    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-6276 ( SUSE ):  3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
  * CVE-2026-6429 ( SUSE ):  8.2
    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-6429 ( SUSE ):  5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

  
Affected Products:

  * SUSE Linux Micro 6.1

  
  
An update that solves six vulnerabilities can now be installed.

## Description:

This update for curl fixes the following issues:

Security issues fixed:

  * CVE-2026-4873: connection reuse ignores TLS requirement (bsc#1262631).
  * CVE-2026-5545: wrong reuse of HTTP Negotiate connection (bsc#1262632).
  * CVE-2026-6253: proxy credentials leak over redirect-to proxy (bsc#1262635).
  * CVE-2026-6276: stale custom cookie host causes cookie leak (bsc#1262636).
  * CVE-2026-6429: netrc credential leak with reused proxy connection
    (bsc#1262638).

Other updates and bugfixes:

  * sws: prevent "connection monitor" to say disconnect twice (bsc#1259362).

## 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 Micro 6.1  
    zypper in -t patch SUSE-SLE-Micro-6.1-517=1

## Package List:

  * SUSE Linux Micro 6.1 (aarch64 ppc64le s390x x86_64)
    * curl-8.14.1-slfo.1.1_7.1
    * libcurl4-8.14.1-slfo.1.1_7.1
    * curl-debugsource-8.14.1-slfo.1.1_7.1
    * libcurl4-debuginfo-8.14.1-slfo.1.1_7.1
    * curl-debuginfo-8.14.1-slfo.1.1_7.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-1965.html
  * https://www.suse.com/security/cve/CVE-2026-4873.html
  * https://www.suse.com/security/cve/CVE-2026-5545.html
  * https://www.suse.com/security/cve/CVE-2026-6253.html
  * https://www.suse.com/security/cve/CVE-2026-6276.html
  * https://www.suse.com/security/cve/CVE-2026-6429.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1259362
  * https://bugzilla.suse.com/show_bug.cgi?id=1262631
  * https://bugzilla.suse.com/show_bug.cgi?id=1262632
  * https://bugzilla.suse.com/show_bug.cgi?id=1262635
  * https://bugzilla.suse.com/show_bug.cgi?id=1262636
  * https://bugzilla.suse.com/show_bug.cgi?id=1262638

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