{"id":"DEBIAN-CVE-2026-44309","details":"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 object bytes. For malformed objects with duplicate tree headers, git-core and go-git parse different trees: git-core uses the first, go-git uses the second. A signature crafted over the go-git-normalized form (second tree) passes gitsign verify while git-core resolves the commit to a completely different tree. This breaks the invariant that a verified signature, the commit semantics git-core presents to users, and the object hash logged in Rekor all refer to the same content. This vulnerability is fixed in 0.16.0.","modified":"2026-08-27T23:06:09.369403963Z","published":"2026-05-15T17:16:47.297Z","upstream":["CVE-2026-44309"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-44309"}],"affected":[{"package":{"name":"gitsign","ecosystem":"Debian:13","purl":"pkg:deb/debian/gitsign?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.13.0-2","0.13.0-3","0.13.0-4","0.13.0-4~exp0","0.14.0-1","0.14.0-1~exp0","0.16.0-1","0.16.1-1","0.16.1-2","0.16.1-2~exp0","0.16.1-3"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-44309.json"}},{"package":{"name":"gitsign","ecosystem":"Debian:14","purl":"pkg:deb/debian/gitsign?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.16.0-1"}]}],"versions":["0.13.0-2","0.13.0-3","0.13.0-4","0.13.0-4~exp0","0.14.0-1","0.14.0-1~exp0"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-44309.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N"}]}