CVE-2026-45022— go-git: Improper parsing of specially crafted objects may lead to inconsistent interpretation compared to upstream Git

go-git: Improper parsing of specially crafted objects may lead to inconsistent interpretation compared to upstream Git

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.

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不正确的行为次序：规范化之前验证

go-git 数据伪造问题漏洞

go-git是go-git开源的一个用纯 Go 编写的高度可扩展的 git 实现库。 go-git 5.19.0之前版本和6.0.0-alpha.3之前版本存在数据伪造问题漏洞，该漏洞源于解析畸形Git对象的方式与上游Git不同，且提交签名和验证逻辑基于解析后的表示而非原始对象字节，可能导致签名验证绕过。

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