SUSE-SU-2026:2703-1: moderate: Security update for curl

[SLE-UPDATES]

# Security update for curl

Announcement ID: SUSE-SU-2026:2703-1  
Release Date: 2026-06-30T10:27:51Z  
Rating: moderate  
References:

  * bsc#1262631
  * bsc#1262632
  * bsc#1262633
  * bsc#1262635
  * bsc#1262636
  * bsc#1262638

  
Cross-References:

  * CVE-2026-4873
  * CVE-2026-5545
  * CVE-2026-5773
  * CVE-2026-6253
  * CVE-2026-6276
  * CVE-2026-6429

  
CVSS scores:

  * 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-2026-4873 ( NVD ):  5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/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-2026-5545 ( NVD ):  6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
  * CVE-2026-5545 ( NVD ):  6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
  * CVE-2026-5773 ( 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-2026-5773 ( SUSE ):  3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
  * CVE-2026-5773 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
  * CVE-2026-5773 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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-2026-6253 ( NVD ):  5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
  * 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-2026-6276 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-6276 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * 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
  * CVE-2026-6429 ( NVD ):  5.3 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

  
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 curl fixes the following issues

  * CVE-2026-4873: connection reuse ignores TLS requirement (bsc#1262631).
  * CVE-2026-5545: wrong reuse of HTTP Negotiate connection (bsc#1262632).
  * CVE-2026-5773: wrong reuse of SMB connection (bsc#1262633).
  * 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).

## 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-2026-2703=1

## Package List:

  * SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security (x86_64)
    * curl-debugsource-8.0.1-11.123.1
    * libcurl4-8.0.1-11.123.1
    * libcurl4-debuginfo-32bit-8.0.1-11.123.1
    * libcurl4-32bit-8.0.1-11.123.1
    * curl-debuginfo-8.0.1-11.123.1
    * curl-8.0.1-11.123.1
    * libcurl4-debuginfo-8.0.1-11.123.1
    * libcurl-devel-8.0.1-11.123.1

## References:

  * 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-2026-5773.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=1262631
  * https://bugzilla.suse.com/show_bug.cgi?id=1262632
  * https://bugzilla.suse.com/show_bug.cgi?id=1262633
  * 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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