---
id: CVE-2026-45022
aliases:
  - GHSA-389r-gv7p-r3rp
  - GO-2026-5074
title: >-
  go-git's improper parsing of specially crafted objects may lead to
  inconsistent interpretation compared to upstream Git
summary: >-
  go-git's improper parsing of specially crafted objects may lead to
  inconsistent interpretation compared to upstream Git
severity: high
vendor: go-git
product: github.com/go-git/go-git/v6
ecosystem: go
affected:
  - 'github.com/go-git/go-git/v6 >= 6.0.0-alpha.1, < 6.0.0-alpha.3'
  - github.com/go-git/go-git/v5 < 5.19.0
patched:
  - github.com/go-git/go-git/v6 6.0.0-alpha.3
  - github.com/go-git/go-git/v5 5.19.0
published: '2026-05-11'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:51:04.377050417Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-389r-gv7p-r3rp'
references:
  - url: 'https://github.com/go-git/go-git/security/advisories/GHSA-389r-gv7p-r3rp'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-45022'
  - url: 'https://github.com/go-git/go-git'
tags:
  - osv
  - go
epss: 0.00159
epssPercentile: 0.04258
ingestedAt: '2026-07-25T19:08:10.993Z'
---

## Overview

### Impact
`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.

### Patches
Users should upgrade to a patched version in order to mitigate this vulnerability. Versions prior to v5 are likely to be affected, users are recommended to upgrade to a supported `go-git` version.

### Credit

Thanks to @bugbunny-research (https://bugbunny.ai/) for reporting this to `sigstore/gitsign`, and to @wlynch, @patzielinski and @adityasaky for coordinating the disclosure with the `go-git` project. :bow: :1st_place_medal: 

Thanks to @wayphinder for reporting this to the `go-git` project. :bow:

## Affected packages

- `github.com/go-git/go-git/v6 >= 6.0.0-alpha.1, < 6.0.0-alpha.3`
- `github.com/go-git/go-git/v5 < 5.19.0`

## Remediation

Upgrade to a patched release:

- `github.com/go-git/go-git/v6 6.0.0-alpha.3`
- `github.com/go-git/go-git/v5 5.19.0`