Vulnerability · Published Feb 9, 2026 · Assigned by GitHub_M
CVE-2026-25934go-git improperly verifies data integrity values for .idx and .pack files
Medium 4.3
In plain English
A medium-severity security flaw 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 a highly extensible git implementation library written in pure Go. Prior to 5.16.5, a vulnerability was discovered in go-git whereby data integrity values for .pack and .idx files were not properly verified. This resulted in go-git potentially consuming corrupted files, which would likely result in unexpected errors such as object not found. For context, clients fetch packfiles from upstream Git servers. Those files contain a checksum of their contents, so that clients can perform integrity checks before consuming it. The pack indexes (.idx) are generated locally by go-git, or the git cli, when new .pack files are received and processed. The integrity checks for both files were not being verified correctly. This vulnerability is fixed in 5.16.5.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | golang-github-go-git-go-git | no fix listed | DEBIAN-CVE-2026-25934 |
| Debian:13 | golang-github-go-git-go-git | no fix listed | DEBIAN-CVE-2026-25934 |
| Debian:14 | golang-github-go-git-go-git | 5.17.0-1 | DEBIAN-CVE-2026-25934 |
| Go | github.com/go-git/go-git | no fix listed | GO-2026-4473 |
| Go | github.com/go-git/go-git/v4 | no fix listed | GO-2026-4473 |
| Go | github.com/go-git/go-git/v5 | 5.16.5 | GHSA-37cx-329c-33x3 |
| Go | github.com/go-git/go-git/v5 | 5.16.5 | GO-2026-4473 |
| Ubuntu:25.10 | golang-github-go-git-go-git | no fix listed | UBUNTU-CVE-2026-25934 |
| Ubuntu:26.10 | golang-github-go-git-go-git | no fix listed | UBUNTU-CVE-2026-25934 |
Affected products (as reported)
Weakness: CWE-354 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
References
- https://github.com/go-git/go-git/security/advisories/GHSA-37cx-329c-33x3 x_refsource_CONFIRM
- https://github.com/go-git/go-git/releases/tag/v5.16.5 x_refsource_MISC