CVE-2026-33762: go-git: Missing validation decoding Index v4 files leads to panic

Severity: low (CVSS 2.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-31 · updated 2026-07-24
Weakness: CWE-129

Description

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.

Affected products

go-git: before 5.17.1 — fixed in 5.17.1

How to fix

Upgrade to a fixed version: go-git 5.17.1. Check the vendor advisory for mitigations.

References

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