Security features bypass in Cosign - #VU125021
Published: April 7, 2026
Vulnerability identifier: #VU125021
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-254
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Sigstore
Affected software:
Cosign
Cosign
Detailed vulnerability description
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to a logic flaw in the error handling of the predicate type validation in cosign verify-blob-attestation. A remote attacker can cause the application to trust the unexpected attestation type.
Remediation
Install updates from vendor's website.