SUSE-SU-2026:2365-1: moderate: Security update for cosign

[SLE-UPDATES]

# Security update for cosign

Announcement ID: SUSE-SU-2026:2365-1  
Release Date: 2026-06-11T07:58:20Z  
Rating: moderate  
References:

  * bsc#1261859

  
Cross-References:

  * CVE-2026-39395

  
CVSS scores:

  * CVE-2026-39395 ( SUSE ):  6.9
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-39395 ( SUSE ):  6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
  * CVE-2026-39395 ( NVD ):  4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
  * CVE-2026-39395 ( NVD ):  5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

  
Affected Products:

  * Basesystem Module 15-SP7
  * openSUSE Leap 15.4
  * SUSE Linux Enterprise Desktop 15 SP7
  * SUSE Linux Enterprise Real Time 15 SP7
  * SUSE Linux Enterprise Server 15 SP7
  * SUSE Linux Enterprise Server for SAP Applications 15 SP7

  
  
An update that solves one vulnerability can now be installed.

## Description:

This update for cosign fixes the following issue

  * CVE-2026-39395: Incorrect attestation verification due to malformed payloads
    or mismatched predicate types (bsc#1261859).

Changes for cosign:

  * update to 3.0.6:
  * Fix DSSE predicate check (GHSA-w6c6-c85g-mmv6) (#4801)
  * Handle whitespace-only certificate annotation (#4760)
  * fix(sign): closing SignerVerifier too early when signing with a security key
    (#4761)
  * Disallow --new-bundle-format and --rfc3161-timestamp (#4762)
  * support managed keys in conformance testing (#4728)
  * Add support for GCE metadata server env var (#4732)
  * fix: preserve per-layer annotations in WriteAttestationsReferrer (#4709)
  * Fix parsing of in-toto for string predicates
  * Mark batch of flags for deprecation (#4698)
  * disallow key and cert identity being used together during verification
    (#4636)
  * support key creation in GitLab group (#4704)
  * Set CGO_ENABLED=1 for fixing s390x failed build
  * build against a maintained golang version (upstream uses go1.20)

## 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:

  * openSUSE Leap 15.4  
    zypper in -t patch SUSE-2026-2365=1

  * Basesystem Module 15-SP7  
    zypper in -t patch SUSE-SLE-Module-Basesystem-15-SP7-2026-2365=1

## Package List:

  * openSUSE Leap 15.4 (aarch64 ppc64le s390x x86_64 i586)
    * cosign-3.0.6-150400.3.42.1
    * cosign-debuginfo-3.0.6-150400.3.42.1
  * openSUSE Leap 15.4 (noarch)
    * cosign-bash-completion-3.0.6-150400.3.42.1
    * cosign-zsh-completion-3.0.6-150400.3.42.1
    * cosign-fish-completion-3.0.6-150400.3.42.1
  * Basesystem Module 15-SP7 (aarch64 ppc64le s390x x86_64)
    * cosign-3.0.6-150400.3.42.1
    * cosign-debuginfo-3.0.6-150400.3.42.1
  * Basesystem Module 15-SP7 (noarch)
    * cosign-bash-completion-3.0.6-150400.3.42.1
    * cosign-zsh-completion-3.0.6-150400.3.42.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-39395.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1261859

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