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-2026-44309 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...

Incorrect Behavior Order: Validate Before Canonicalize

Overview Affected versions of this package are vulnerable to Incorrect Behavior Order: Validate Before Canonicalize in the parsing of Git objects with malformed or ambiguous commit or tag objects. An attacker can cause inconsistent interpretation of object metadata or signature validation by...

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 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:...