Improper Verification of Cryptographic Signature Affecting cosign package, versions <0:3.1.2-0.2.hum1


Severity

Recommended
0.0
low
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.13% (3rd percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-RHEL10-COSIGN-18523073
  • published5 Aug 2026
  • disclosed31 Jul 2026

Introduced: 31 Jul 2026

CVE-2026-54787  (opens in a new tab)
CWE-347  (opens in a new tab)

How to fix?

Upgrade RHEL:10 cosign to version 0:3.1.2-0.2.hum1 or higher.
This issue was patched in RHSA-2026:44451.

NVD Description

Note: Versions mentioned in the description apply only to the upstream cosign package and not the cosign package as distributed by RHEL. See How to fix? for RHEL:10 relevant fixed versions and status.

sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.1, sigstore-go does not check a bundle signing timestamp against the validity window of an ExpiringKey wrapping a self-managed long-lived signing key without a certificate, which can allow an attacker holding expired key material to sign accepted bundles. This issue is fixed in version 1.2.1.

CVSS Base Scores

version 3.1