What is CVE-2026-22703?

CVE-2026-22703 is a medium-severity vulnerability in Sigstore Cosign, classified under Insufficient Verification of Data Authenticity. CVSS score: 5.5/10. Published 2026-01-10.

How severe is CVE-2026-22703?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Sigstore Cosign

CVE-2026-22703

Cosign provides code signing and transparency for containers and binaries. Prior to versions 2.6.2 and 3.0.4, Cosign bundle can be crafted to successfully verify an artifact even if the embedded Rekor entry does not reference the artifact'…

EPSS: 0.000 (0.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

Affected products

Sigstore Cosign — versions < 3.0.4, < 2.6.2

Weakness classification (CWE)

CWE-345 — Insufficient Verification of Data Authenticity

References

https://github.com/sigstore/cosign/security/advisories/GHSA-whqx-f9j3-ch6m (x_refsource_CONFIRM)
https://github.com/sigstore/cosign/pull/4623 (x_refsource_MISC)
https://github.com/sigstore/cosign/commit/6832fba4928c1ad69400235bbc41212de5006176 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-22703?: CVE-2026-22703 is a medium-severity vulnerability in Sigstore Cosign, classified under Insufficient Verification of Data Authenticity. CVSS score: 5.5/10. Published 2026-01-10.
How severe is CVE-2026-22703?: Medium severity. CVSS v3 base score is 5.5 out of 10.