CVE-2026-44309 gitsign verify accepts signatures over go-git-normalized bytes, enabling trust confusion on malformed commits

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 the signature, instead of verifying against the raw git...

CVE-2026-44309

Summary: CVE-2026-44309 affects gitsign up to version 0.15.x, fixed in 0.16.0. The issue arises because gitsign verify and verify-tag re-encode commits/tags using go-git’s EncodeWithoutSignature instead of verifying raw bytes. Go-git performs loose parsing and discards the first of two identical ...

CVE-2026-44310 gitsign --verify panics on empty-certificate PKCS7 and exits 0, bypassing exit-code callers

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 certs0 after sd.GetCertificates without checking the slice length. A CMS/PKCS7 signed message with...

CVE-2026-44310 gitsign --verify panics on empty-certificate PKCS7 and exits 0, bypassing exit-code callers

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 certs0 after sd.GetCertificates without checking the slice length. A CMS/PKCS7 signed message with...

gitsign verify accepts signatures over go-git-normalized bytes, enabling trust confusion on malformed commits

Summary gitsign verify and gitsign verify-tag re-encode commit/tag objects through go-git's EncodeWithoutSignature before checking the signature, instead of verifying against the raw git object bytes. For malformed objects with duplicate tree headers, git-core and go-git parse different trees:...

GHSA-7RMH-48MX-2VWC gitsign verify accepts signatures over go-git-normalized bytes, enabling trust confusion on malformed commits

Summary gitsign verify and gitsign verify-tag re-encode commit/tag objects through go-git's EncodeWithoutSignature before checking the signature, instead of verifying against the raw git object bytes. For malformed objects with duplicate tree headers, git-core and go-git parse different trees:...

gitsign --verify panics on empty-certificate PKCS7 and exits 0, bypassing exit-code callers

Summary CertVerifier.Verify in pkg/git/verifier.go unconditionally dereferences certs0 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,...

GHSA-7C37-GX6W-8VC5 gitsign --verify panics on empty-certificate PKCS7 and exits 0, bypassing exit-code callers

Summary CertVerifier.Verify in pkg/git/verifier.go unconditionally dereferences certs0 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,...