Security update for cosign

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