CVE-2026-45022
go-git's improper parsing of specially crafted objects may lead to inconsistent interpretation compared to upstream Git
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/go-git/go-git/v6 | >= 6.0.0-alpha.1, <= 6.0.0-alpha.2 | 6.0.0-alpha.3 |
| go | github.com/go-git/go-git/v5 | < 5.19.0 | 5.19.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Go-Git Project | Go-Git | before 5.19.0 Version 6.0.0 |