GHSA-8fp4-rp6c-5gcv
HIGHPath Traversal in com.linecorp.armeria:armeria
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
com.linecorp.armeria:armeriaReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.
Description
Impact
An attacker can access an Armeria server's local file system beyond its restricted directory by sending an HTTP request whose path contains %2F (encoded /), such as /files/..%2Fsecrets.txt, bypassing Armeria's path validation logic.
Patches
Armeria 1.13.4 or above contains the hardened path validation logic that handles %2F properly.
Workarounds
This vulnerability can be worked around by inserting a decorator that performs an additional validation on the request path, e.g.
Server
.builder()
.serviceUnder(
"/files",
FileService
.of(...)
.decorate((delegate, ctx, req) -> {
String path = req.headers().path();
if (path.contains("%2f") || path.contains("%2F")) {
return HttpResponse.of(HttpStatus.BAD_REQUEST);
}
return delegate.serve(ctx, req);
})
)
.build()
For more information
If you have any questions or comments about this advisory:
- Open an issue in line/armeria
- Chat with us at Slack
Credits
This vulnerability was originally reported by Abdallah Zaher (elcayser-0x0a).
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | com.linecorp.armeria:armeria | ≥ 1.12.0&&< 1.13.4 | 1.13.4 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for com.linecorp.armeria:armeria. 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 com.linecorp.armeria:armeria to 1.13.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-8fp4-rp6c-5gcv 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-8fp4-rp6c-5gcv 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-8fp4-rp6c-5gcv. 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-8fp4-rp6c-5gcv in your dependencies?
O3 detects GHSA-8fp4-rp6c-5gcv across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.