CVE-2026-34165
MediumCVSS 5.0Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
In the go-git library (pure Go git implementation) versions 5.0.0 to before 5.17.1, 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. This issue has been patched in version 5.17.1.
Risk Assessment
An attacker with write access to the repository could cause a service outage by exhausting memory, impacting system availability.
Recommendation
Upgrade the go-git library to version 5.17.1 or later.
Other vulnerabilities in go-git
See all- CVE-2026-71557Medium
go-git is a git implementation library in pure Go. Prior to 5.19.2 and 6.0.0-alpha.5, reference names are not sanitized before being used to construct on-disk paths, so a maliciously crafted reference name can cause writes outside the intended directory. Versions 5.19.2 and 6.0.0-alpha.5 fix the issue.
- CVE-2026-71556High
go-git prior to versions 5.19.2 and 6.0.0-alpha.5 has a vulnerability where worktree operations (checkout, status, add) resolve symbolic links without confining resolution to the worktree boundary. A maliciously crafted repository containing a symlink can cause go-git to read from or write to files outside the intended working directory.
- CVE-2026-33762Low
go-git is a pure Go Git implementation library. Prior to version 5.17.1, the index decoder for format version 4 fails to validate the path name prefix length before applying it to the previously decoded path name. A maliciously crafted index file can trigger an out-of-bounds slice operation, resulting in a runtime panic during normal index parsing. This issue only affects Git index format version 4; earlier formats (v2 and v3) are not vulnerable.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS