Insufficient verification of data authenticity in Cosign - CVE-2026-22703

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Main Vulnerability Database Vulnerabilities #VU127931

Insufficient verification of data authenticity in Cosign - CVE-2026-22703

Published: April 25, 2026


Vulnerability identifier: #VU127931
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-22703
CWE-ID: CWE-345
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to cause acceptance of an invalid signing bundle.

The vulnerability exists due to insufficient verification of data authenticity in Rekor entry verification when verifying a crafted Cosign bundle. A local user can include an arbitrary valid Rekor entry in the bundle to cause acceptance of an invalid signing bundle.

This only affects verification when a trusted root is provided via --trusted-root or fetched automatically from a TUF repository and no trusted key material is provided via SIGSTORE_REKOR_PUBLIC_KEY.


Affected software

Cosign
Anolis OS
cosign

How to mitigate CVE-2026-22703

Install security update from vendor's website.

Cosign - addressed in versions 2.6.2, 3.0.4
cosign - update to 2.5.2-2

External References

Related Security Bulletins