CVE-2026-33762
LowCVSS 2.8Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
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.
Risk Assessment
An attacker can cause a crash in applications using go-git to parse a malicious index file, leading to denial of service (DoS).
Recommendation
Update go-git 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-2026-34165Medium
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.
Original NVD description (English source)
go-git is an extensible git implementation library written in pure Go. Prior to version 5.17.1, go-git’s 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 (go-git supports only v2 and v3) are not vulnerable to this issue. This issue has been patched in version 5.17.1.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS