GHSA-4ff6-858j-r822
MEDIUMGomatrixserverlib Server-Side Request Forgery (SSRF) on redirects and federation
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
github.com/matrix-org/gomatrixserverlibReal-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
Gomatrixserverlib is vulnerable to server-side request forgery, serving content from a private network it can access, under certain conditions.
Patches
c4f1e01eab0dd435709ad15463ed38a079ad6128 fixes this issue.
Workarounds
Use a local firewall to limit the network segments and hosts the service using gomatrixserverlib can access.
References
N/A
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/matrix-org/gomatrixserverlib | all versions | 0.0.0-20250116181547-c4f1e01eab0d |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/matrix-org/gomatrixserverlib. 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
Update github.com/matrix-org/gomatrixserverlib to 0.0.0-20250116181547-c4f1e01eab0d or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-4ff6-858j-r822 is resolved across your whole dependency graph.
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-4ff6-858j-r822 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-4ff6-858j-r822. 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-4ff6-858j-r822 in your dependencies?
O3 detects GHSA-4ff6-858j-r822 across Go dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.