Maliciously crafted Git server replies can cause DoS on go-git clients

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-2023-49568: 0.70% estimated exploitation activity in the next 30 days; percentile 53.15 (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 v5.11. 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. Applications using only the in-memory filesystem supported by go-git are not affected by this vulnerability. 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 v5.11 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. References - GHSA-mw99-9chc-xw7r

Published by the source

27 Dec 2023, 15:06 UTC

Last modified by the source

6 Jan 2025, 15:20 UTC

Source last checked

26 Oct 2026, 15:08 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-mw99-9chc-xw7r

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# Patch Next advisory brief: CVE-2023-49568

Advisory: Maliciously crafted Git server replies can cause DoS on go-git clients
IDs: CVE-2023-49568, GHSA-mw99-9chc-xw7r
Record: https://patchnext.com/advisories/cve-2023-49568 (revision 1, source checked 26 Oct 2026, 15:08 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 5.11.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/go-git/go-git/v5: affected < 5.11.0; fixed in 5.11.0
- Go gopkg.in/src-d/go-git.v4: affected >= 4.7.1, <= 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.

## 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.
- 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-mw99-9chc-xw7r (GitHub-reviewed advisory GHSA-mw99-9chc-xw7r lists affected ranges: Go github.com/go-git/go-git/v5 >=0 =4.7.1 <=4.13.1)

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