Vulnerability · Published May 27, 2026 · Assigned by GitHub_M
CVE-2026-45022go-git: Improper parsing of specially crafted objects may lead to inconsistent interpretation compared to upstream Git
High 7.0
In plain English
A high-severity insufficient verification of data authenticity in go-git from go-git. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
go-git is an extensible git implementation library written in pure Go. Prior to 5.19.0 and 6.0.0-alpha.3, 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. Additionally, 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. This 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. This vulnerability is fixed in 5.19.0 and 6.0.0-alpha.3.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | golang-github-go-git-go-git | no fix listed | DEBIAN-CVE-2026-45022 |
| Debian:13 | golang-github-go-git-go-git | no fix listed | DEBIAN-CVE-2026-45022 |
| Debian:14 | golang-github-go-git-go-git | 5.19.1-1 | DEBIAN-CVE-2026-45022 |
| Debian:14 | golang-github-go-git-go-git-v6 | 6.0.0~alpha4-1 | DEBIAN-CVE-2026-45022 |
| Go | github.com/go-git/go-git/v5 | 5.19.0 | GHSA-389r-gv7p-r3rp |
| Go | github.com/go-git/go-git/v5 | 5.19.0 | GO-2026-5074 |
| Go | github.com/go-git/go-git/v6 | 6.0.0-alpha.3 | GHSA-389r-gv7p-r3rp |
| Ubuntu:25.10 | golang-github-go-git-go-git | no fix listed | UBUNTU-CVE-2026-45022 |
| Ubuntu:26.10 | golang-github-go-git-go-git | no fix listed | UBUNTU-CVE-2026-45022 |
Affected products (as reported)
Weakness: CWE-180, CWE-345 · Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N
References
- https://github.com/go-git/go-git/security/advisories/GHSA-389r-gv7p-r3rp x_refsource_CONFIRM