{"id":"CVE-2026-45022","aliases":["GHSA-389r-gv7p-r3rp","GO-2026-5074"],"url":"https://o3.security/vulnerability/CVE-2026-45022","summary":"go-git: Improper parsing of specially crafted objects may lead to inconsistent interpretation compared to upstream Git","details":"### Impact\n`go-git` may parse malformed Git objects in a way that differs from upstream Git. When `commit` or `tag` objects contain ambiguous or malformed headers, `go-git`’s decoded representation may expose values differently from how Git itself would interpret or reject the same object.\n\nAdditionally, `go-git`’s commit signing and verification logic operates over commit data reconstructed from `go-git`’s parsed representation rather than the original raw object bytes. As a result, `go-git` may sign or verify a commit payload that is not byte-for-byte equivalent to the object stored in the repository.\n\nThis can cause a signature to appear valid for a commit whose displayed or effective metadata differs from the object that was intended to be signed.\n\n### Patches\nUsers should upgrade to a patched version in order to mitigate this vulnerability. Versions prior to v5 are likely to be affected, users are recommended to upgrade to a supported `go-git` version.\n\n### Credit\n\nThanks to @bugbunny-research (https://bugbunny.ai/) for reporting this to `sigstore/gitsign`, and to @wlynch, @patzielinski and @adityasaky for coordinating the disclosure with the `go-git` project. :bow: :1st_place_medal: \n\nThanks to @wayphinder for reporting this to the `go-git` project. :bow:","published":"2026-05-27T14:54:47.872Z","modified":"2026-08-27T18:26:14.717234314Z","cvss":null,"epss":{"score":0.00159,"percentile":0.05271,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/go-git/go-git/v6","fixedVersion":"6.0.0-alpha.3"},{"ecosystem":"Go","name":"github.com/go-git/go-git/v5","fixedVersion":"5.19.0"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45022.json"},{"type":"ADVISORY","url":"https://github.com/go-git/go-git/security/advisories/GHSA-389r-gv7p-r3rp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45022"},{"type":"PACKAGE","url":"https://github.com/go-git/go-git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-27T18:26:14.717234314Z"}}