Decoded: Small Business Cybersecurity News & Insights

Go-Git Clients Vulnerable to DoS via Malicious Git Server Replies

Published Date: January 7, 2025

Package Affected Versions Patched Versions Severity
📦 gopkg.in/src-d/go-git.v4 (Go) >= 4.0.0, <= 4.13.1 – High

Description

A Denial of Service (DoS) vulnerability exists in go-git, a popular library for interacting with Git repositories in Go. Attackers can exploit this flaw by sending specially crafted responses from a Git server. These responses cause resource exhaustion in go-git clients, potentially rendering them unresponsive.

Important Note: This vulnerability only affects go-git implementations. The standard Git CLI remains unaffected.



Affected Versions:



  • github.com/go-git/go-git (Go): >= 4.0.0, <= 4.13.1

  • gopkg.in/src-d/go-git.v4 (Go): >= 4.0.0, <= 4.13.1


Patched Versions:



  • github.com/go-git/go-git/v5: >= 5.13.0





Impact:


Attackers can use malicious Git server replies to overwhelm client resources, leading to service interruptions or crashes.

Patches & Workarounds


  • Upgrade to v5.13.0: If you’re using a vulnerable version, update your dependency to go-git v5.13.0 immediately.


Example in go.mod:

require github.com/go-git/go-git/v5 v5.13.0





Workarounds:


If upgrading isn’t possible:

  1. Restrict Access: Only connect to trusted Git servers.

  2. Monitor Traffic: Watch for unusual activity or responses from Git servers.





While upgrading is the ideal fix, restricting connections to trusted sources provides a reasonable stopgap. Stay safe out there—malicious Git servers aren’t something you want sneaking into your build pipeline.

References

https://nvd.nist.gov/vuln/detail/CVE-2025-21614
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