CVE-2026-44310

MediumCVSS 5.4

Published: 15/05/2026(UTC)Updated: 26/10/2026(UTC)Translated: 26/10/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.11%

1th percentile - higher than 1% of all known CVEs

Summary

Gitsign is a keyless Sigstore signing tool for Git commits with a GitHub/OIDC identity. From 0.4.0 to before 0.15.0, CertVerifier.Verify() unconditionally dereferences certs[0] after sd.GetCertificates() without checking the slice length; a CMS/PKCS7 signed message with an empty certificate set causes an index-out-of-range panic that is silently recovered on the gitsign --verify path, returning exit code 0 and causing failed verification to be interpreted as success. This is fixed in 0.15.0.

Risk Assessment

A failed signature verification may be interpreted as success, allowing bypass of commit integrity checks.

Recommendation

Update Gitsign to version 0.15.0 or later.

Other vulnerabilities in Gitsign

CVE-2026-44309Medium
Gitsign is a keyless Sigstore signing tool for Git commits with 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 the signature; for malformed objects with duplicate tree headers, git-core and go-git parse different trees, so a signature over the go-git-normalized form passes verification while git-core resolves a different tree. This is fixed in 0.16.0.

Original NVD description (English source)

Gitsign is a keyless Sigstore to signing tool for Git commits with your a GitHub / OIDC identity. From 0.4.0 to before 0.15.0, CertVerifier.Verify() in pkg/git/verifier.go unconditionally dereferences certs[0] after sd.GetCertificates() without checking the slice length. A CMS/PKCS7 signed message with an empty certificate set is a structurally valid DER payload; GetCertificates() returns an empty slice with no error, causing an immediate index-out-of-range panic. On the gitsign --verify code path (the GPG-compatible mode invoked by git verify-commit), the panic is silently recovered by internal/io/streams.go's Wrap() function, which returns nil instead of an error. main.go then exits with code 0, causing exit-code-only verification callers to interpret the failed verification as success. This vulnerability is fixed in 0.15.0.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS