go-git clients vulnerable to DoS via maliciously crafted Git server replies

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

• CVE-2025-21614: 0.72% estimated exploitation activity in the next 30 days; percentile 53.86 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Impact A denial of service (DoS) vulnerability was discovered in go-git versions prior to v5.13. This vulnerability allows an attacker to perform denial of service attacks by providing specially crafted responses from a Git server which triggers resource exhaustion in go-git clients. This is a go-git implementation issue and does not affect the upstream git cli. Patches Users running versions of go-git from v4 and above are recommended to upgrade to v5.13 in order to mitigate this vulnerability. Workarounds In cases where a bump to the latest version of go-git is not possible, we recommend limiting its use to only trust-worthy Git servers. Credit Thanks to Ionut Lalu for responsibly disclosing this vulnerability to us.

Published by the source

6 Jan 2025, 16:20 UTC

Last modified by the source

27 Aug 2025, 14:24 UTC

Source last checked

26 Oct 2026, 15:10 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-r9px-m959-cxf4

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# Patch Next advisory brief: CVE-2025-21614

Advisory: go-git clients vulnerable to DoS via maliciously crafted Git server replies
IDs: CVE-2025-21614, GHSA-r9px-m959-cxf4
Record: https://patchnext.com/advisories/cve-2025-21614 (revision 1, source checked 26 Oct 2026, 15:10 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Partial vendor fix; fixed versions by package: github.com/go-git/go-git/v5 5.13.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/go-git/go-git/v5: affected < 5.13.0; fixed in 5.13.0
- Go gopkg.in/src-d/go-git.v4: affected >= 4.0.0, <= 4.13.1
- Go github.com/go-git/go-git: affected >= 4.0.0, <= 4.13.1

## Suggested inspection (read-only)
- Go github.com/go-git/go-git/v5: check the installed version with your package manager.
- Go gopkg.in/src-d/go-git.v4: check the installed version with your package manager.
- Go github.com/go-git/go-git: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/go-git/go-git/v5, gopkg.in/src-d/go-git.v4, github.com/go-git/go-git.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-r9px-m959-cxf4 (GitHub-reviewed advisory GHSA-r9px-m959-cxf4 lists affected ranges: Go gopkg.in/src-d/go-git.v4 >=4.0.0 =0 =4.0.0 <=4.13.1)

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