SUSE-SU-2026:24213-1: important: Security update for cosign

Tue Oct 20 20:45:35 UTC 2026

# Security update for cosign

Announcement ID: SUSE-SU-2026:24213-1  
Release Date: 2026-10-09T06:33:57Z  
Rating: important  
References:

  * bsc#1272117
  * bsc#1275025
  * bsc#1278614
  * bsc#1279215
  * bsc#1282542

Cross-References:

  * CVE-2026-56852
  * CVE-2026-56854
  * CVE-2026-56855
  * CVE-2026-56864
  * CVE-2026-78662
  * CVE-2026-84304

CVSS scores:

  * CVE-2026-56852 ( SUSE ):  6.0
    CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-56852 ( SUSE ):  5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-56852 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-56854 ( SUSE ):  8.6
    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-56854 ( SUSE ):  8.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
  * CVE-2026-56854 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
  * CVE-2026-56855 ( SUSE ):  8.7
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-56855 ( SUSE ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-56855 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-56864 ( SUSE ):  5.3 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
  * CVE-2026-56864 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
  * CVE-2026-78662 ( SUSE ):  8.7
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-78662 ( SUSE ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
  * CVE-2026-78662 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
  * CVE-2026-84304 ( SUSE ):  8.7
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-84304 ( SUSE ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-84304 ( NVD ):  8.7
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected Products:

  * SUSE Linux Enterprise Server 16.0
  * SUSE Linux Enterprise Server for SAP applications 16.0

An update that solves six vulnerabilities can now be installed.

## Description:

This update for cosign fixes the following issues:

  * CVE-2026-56852: golang.org/x/text/unicode/norm: infinite loop on
    truncated/invalid UTF-8 input (bsc#1272117).
  * CVE-2026-56854,CVE-2026-56855,CVE-2026-78662: golang.org/x/crypto/ssh:
    authentication bypass and deadlocks in the crypto/ssh library (bsc#1278614).
  * CVE-2026-56864: x/mod/sumdb: ignore unrelated, unauthenticated hashes in
    Lookup (bsc#1275025).
  * CVE-2026-84304: google.golang.org/grpc: heap memory exhaustion via HTTP/2
    DATA frame fragmentation (bsc#1279215).
  * Verification bypass via public key in legacy bundle (bsc#1282542).

Changes for cosign:

  * update to 3.1.3 (bsc#1282542, GHSA-fx35-mq7g-6g98):
  * This release resolves GHSA-fx35-mq7g-6g98, a verification bypass using an
    unexpected public key in a legacy bundle.
  * Auto-detect default digest algorithm for public keys
  * fix(pkcs11key): return an error instead of panicking when no key pair
    matches
  * Supporting OCI Signing with X.509 Certificate Chain
  * test(inspect): replace mock TSA client usage with local timestamp response
    generator in
  * fix: prevent shell completions for various options not taking filenames
  * fix(blob): compare file checksums case-insensitively in
  * Verification bypass via public key in legacy bundle (GHSA- fx35-mq7g-6g98)

## 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 for SAP applications 16.0  
    zypper in -t patch SUSE-SLES-16.0-1877

  * SUSE Linux Enterprise Server 16.0  
    zypper in -t patch SUSE-SLES-16.0-1877

## Package List:

  * SUSE Linux Enterprise Server for SAP applications 16.0 (ppc64le x86_64)
    * cosign-debuginfo-3.1.3-160000.1.1
    * cosign-3.1.3-160000.1.1
  * SUSE Linux Enterprise Server 16.0 (aarch64 ppc64le s390x x86_64)
    * cosign-debuginfo-3.1.3-160000.1.1
    * cosign-3.1.3-160000.1.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-56852.html
  * https://www.suse.com/security/cve/CVE-2026-56854.html
  * https://www.suse.com/security/cve/CVE-2026-56855.html
  * https://www.suse.com/security/cve/CVE-2026-56864.html
  * https://www.suse.com/security/cve/CVE-2026-78662.html
  * https://www.suse.com/security/cve/CVE-2026-84304.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1272117
  * https://bugzilla.suse.com/show_bug.cgi?id=1275025
  * https://bugzilla.suse.com/show_bug.cgi?id=1278614
  * https://bugzilla.suse.com/show_bug.cgi?id=1279215
  * https://bugzilla.suse.com/show_bug.cgi?id=1282542

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