{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/67929?format=json","vulnerability_id":"VCID-vtc5-gt7p-4bcd","summary":"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.","aliases":[{"alias":"CVE-2026-44309"},{"alias":"GHSA-7rmh-48mx-2vwc"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/1076681?format=json","purl":"pkg:deb/debian/gitsign@0.16.0-1","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/gitsign@0.16.0-1"},{"url":"http://public2.vulnerablecode.io/api/packages/43305?format=json","purl":"pkg:deb/debian/gitsign@0.16.0-1?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/gitsign@0.16.0-1%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/1206452?format=json","purl":"pkg:deb/debian/gitsign@0.16.1-1?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/gitsign@0.16.1-1%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/375948?format=json","purl":"pkg:golang/github.com/sigstore/gitsign@0.16.0","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:golang/github.com/sigstore/gitsign@0.16.0"}],"affected_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/43307?format=json","purl":"pkg:deb/debian/gitsign@0.13.0-2?distro=trixie","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-6rwy-1v1h-ekfq"},{"vulnerability":"VCID-vtc5-gt7p-4bcd"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/gitsign@0.13.0-2%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/1076680?format=json","purl":"pkg:deb/debian/gitsign@0.13.0-2","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-6rwy-1v1h-ekfq"},{"vulnerability":"VCID-vtc5-gt7p-4bcd"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/gitsign@0.13.0-2"}],"references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2026-44309","reference_id":"","reference_type":"","scores":[{"value":"0.00013","scoring_system":"epss","scoring_elements":"0.02106","published_at":"2026-06-14T12:55:00Z"},{"value":"0.00013","scoring_system":"epss","scoring_elements":"0.02097","published_at":"2026-06-13T12:55:00Z"},{"value":"0.00013","scoring_system":"epss","scoring_elements":"0.021","published_at":"2026-06-12T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-44309"},{"reference_url":"https://github.com/sigstore/gitsign","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/sigstore/gitsign"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44309","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44309"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1136789","reference_id":"1136789","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1136789"},{"reference_url":"https://github.com/sigstore/gitsign/security/advisories/GHSA-7rmh-48mx-2vwc","reference_id":"GHSA-7rmh-48mx-2vwc","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-15T17:43:27Z/"}],"url":"https://github.com/sigstore/gitsign/security/advisories/GHSA-7rmh-48mx-2vwc"}],"weaknesses":[{"cwe_id":295,"name":"Improper Certificate Validation","description":"The product does not validate, or incorrectly validates, a certificate."},{"cwe_id":347,"name":"Improper Verification of Cryptographic Signature","description":"The product does not verify, or incorrectly verifies, the cryptographic signature for data."}],"exploits":[],"severity_range_score":"4.0 - 6.9","exploitability":"0.5","weighted_severity":"6.2","risk_score":3.1,"resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-vtc5-gt7p-4bcd"}