What is CVE-2026-44309?

CVE-2026-44309 is a medium-severity vulnerability in Sigstore Gitsign, classified under Improper Certificate Validation. CVSS score: 5.3/10. Published 2026-05-15.

How severe is CVE-2026-44309?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Sigstore Gitsign

CVE-2026-44309

Gitsign is a keyless Sigstore to signing tool for Git commits with your a GitHub / OIDC identity. Prior to 0.16.0, gitsign verify and gitsign verify-tag re-encode commit/tag objects through go-git's EncodeWithoutSignature before checking t…

Vulnerability class: Improper Certificate Validation

EPSS: 0.000 (2.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N.

Affected products

Sigstore Gitsign — versions < 0.16.0

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation
CWE-347 — Improper Verification of Cryptographic Signature

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-44309?: CVE-2026-44309 is a medium-severity vulnerability in Sigstore Gitsign, classified under Improper Certificate Validation. CVSS score: 5.3/10. Published 2026-05-15.
How severe is CVE-2026-44309?: Medium severity. CVSS v3 base score is 5.3 out of 10.