What’s Vulnerable › Vulnerabilities
CVE-2026-45022: go-git: Improper parsing of specially crafted objects may lead to inconsistent interpretation compared to upstream Git
- Severity: high (CVSS 7.5 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: 2026-05-27 · updated 2026-06-17
- Weakness: CWE-180
Description
go-git is an extensible git implementation library written in pure Go. Prior to 5.19.0 and 6.0.0-alpha.3, go-git may parse malformed Git objects in a way that differs from upstream Git. When commit or tag objects contain ambiguous or malformed headers, go-git’s decoded representation may expose values differently from how Git itself would interpret or reject the same object. Additionally, go-git’s commit signing and verification logic operates over commit data reconstructed from go-git’s parsed representation rather than the original raw object bytes. As a result, go-git may sign or verify a commit payload that is not byte-for-byte equivalent to the object stored in the repository. This can cause a signature to appear valid for a commit whose displayed or effective metadata differs from the object that was intended to be signed. This vulnerability is fixed in 5.19.0 and 6.0.0-alpha.3.
Affected products
- go-git: before 5.19.0; 6.0.0-alpha1, 6.0.0-alpha2 — fixed in 5.19.0
How to fix
Upgrade to a fixed version: go-git 5.19.0. Check the vendor advisory for mitigations.
References
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