Vulnerability in Go-Git
CVE-2026-25934
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (4.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 4.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.000
Affected products
- Go-Git — versions < 5.16.5
- Go-Git Project
Weakness classification (CWE)
References
- github.com/go-git/go-git/security/advisories/GHSA-37cx-329c-33x3 (Patch, Vendor Advisory)
- github.com/go-git/go-git/releases/tag/v5.16.5 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-25934?
- CVE-2026-25934 is a medium-severity vulnerability in Go-Git, classified under Improper Validation of Integrity Check Value. CVSS score: 4.3/10. Published 2026-02-09.
- How severe is CVE-2026-25934?
- Medium severity. CVSS v3 base score is 4.3 out of 10.