GHSA-r9px-m959-cxf4
HIGHgo-git clients vulnerable to DoS via maliciously crafted Git server replies
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Blast Radius
gopkg.in/src-d/go-git.v4🐹github.com/go-git/go-git/v5🐹github.com/go-git/go-gitReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
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.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | gopkg.in/src-d/go-git.v4 | ≥ 4.0.0 | No fix |
| 🐹Go | github.com/go-git/go-git/v5 | all versions | 5.13.0 |
| 🐹Go | github.com/go-git/go-git | ≥ 4.0.0 | No fix |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for gopkg.in/src-d/go-git.v4. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
No patched version of gopkg.in/src-d/go-git.v4 has shipped for GHSA-r9px-m959-cxf4 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-r9px-m959-cxf4 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-r9px-m959-cxf4. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-r9px-m959-cxf4 in your dependencies?
O3 detects GHSA-r9px-m959-cxf4 across Go dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.