CVE-2026-22703

CVE-2026-22703 is a medium-severity vulnerability affecting sigstore cosign versions prior to 2.6.2 and 3.0.4. It allows a malicious actor to craft a Cosign bundle that appears valid even if the embedded Rekor entry does not accurately reflect the artifact's digest, signature, or public key. This could prevent users from auditing signing events, as Cosign would accept any Rekor response as legitimate. The vulnerability has a CVSS score of 5.5, indicating a local attack vector with low complexity, requiring low privileges, and resulting in high integrity impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or inclusion in the CISA KEV catalog. Community discussion and media coverage are minimal, with only one mention and one article identified.