Integer overflow in Go-Git
CVE-2026-34165
go-git is an extensible git implementation library written in pure Go. From version 5.0.0 to before version 5.17.1, a vulnerability has been identified in which a maliciously crafted .idx file can cause asymmetric memory consumption, potentially exhausting available memory and resulting in a denial-of-service (DoS) condition. Exploitation requires write access to the local repository's .git directory, it order to create or alter existing .idx files. This issue has been patched in version 5.17.1.
EPSS: 0.001 (4.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H.
Affected products
- Go-git — versions >= 5.0.0, < 5.17.1
- Go-git_project Go-git
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (Product, x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-34165?
- CVE-2026-34165 is a medium-severity vulnerability in Go-Git, classified under Integer Underflow. CVSS score: 5.0/10. Published 2026-03-31.
- How severe is CVE-2026-34165?
- Medium severity. CVSS v3 base score is 5.0 out of 10.