---
id: CVE-2023-22742
aliases:
  - GHSA-m4ch-rfv5-x5g3
  - GHSA-8643-3wh5-rmjq
  - RUSTSEC-2023-0003
title: git2-rs fails to verify SSH keys by default
summary: git2-rs fails to verify SSH keys by default
severity: medium
cvss: 6.8
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N'
vendor: libgit2-sys
product: libgit2-sys
ecosystem: rust
affected:
  - 'libgit2-sys >= 0.14.0, < 0.14.2'
  - libgit2-sys < 0.13.5
  - git2 < 0.16.1
patched:
  - libgit2-sys 0.14.2
  - libgit2-sys 0.13.5
  - git2 0.16.1
published: '2023-01-20'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T17:07:22Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-m4ch-rfv5-x5g3'
references:
  - url: 'https://github.com/libgit2/libgit2/security/advisories/GHSA-8643-3wh5-rmjq'
  - url: >-
      https://github.com/rust-lang/git2-rs/security/advisories/GHSA-m4ch-rfv5-x5g3
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2023-22742'
  - url: >-
      https://github.com/rust-lang/git2-rs/commit/87934f87d36753ed702792ec063be7246444a8e1
  - url: 'https://github.com/rust-lang/git2-rs'
  - url: 'https://rustsec.org/advisories/RUSTSEC-2023-0003.html'
  - url: 'https://crates.io/crates/libgit2-sys'
tags:
  - osv
  - rust
epss: 0.0058
epssPercentile: 0.47507
ingestedAt: '2026-10-13T11:45:30.161Z'
---

## Overview

The git2 and libgit2-sys crates are Rust wrappers around the [libgit2](https://libgit2.org/) C library. It was discovered that libgit2 1.5.0 and below did not verify SSH host keys when establishing an SSH connection, exposing users of the library to Man-In-the-Middle attacks.

The libgit2 team assigned [CVE-2023-22742](https://github.com/libgit2/libgit2/security/advisories/GHSA-8643-3wh5-rmjq) to this vulnerability. The following versions of the libgit2-sys Rust crate have been released:

* libgit2-sys 0.14.2, updating the underlying libgit2 C library to version 1.5.1.
* libgit2-sys 0.13.5, updating the underlying libgit2 C library to version 1.4.5.

A new git2 crate version has also been released, 0.16.1. This version only bumps its libgit2-sys dependency to ensure no vulnerable libgit2-sys versions are used, but contains no code changes: if you update the libgit2-sys version there is no need to also update the git2 crate version.

[You can learn more about this vulnerability in libgit2's advisory](https://github.com/libgit2/libgit2/security/advisories/GHSA-8643-3wh5-rmjq)

## Affected packages

- `libgit2-sys >= 0.14.0, < 0.14.2`
- `libgit2-sys < 0.13.5`
- `git2 < 0.16.1`

## Remediation

Upgrade to a patched release:

- `libgit2-sys 0.14.2`
- `libgit2-sys 0.13.5`
- `git2 0.16.1`