GHSA-fv82-r8qv-ch4v is a medium-severity (CVSS 6.1) vulnerability in github.com/pomerium/pomerium. O3 Security confirms whether GHSA-fv82-r8qv-ch4v is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
pomerium_signature is not verified in middleware in github.com/pomerium/pomerium
Real-World Exposure
github.com/pomerium/pomeriumReal-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
Some API endpoints under /.pomerium/ do not verify parameters with pomerium_signature. This could allow modifying parameters intended to be trusted to Pomerium.
The issue mainly affects routes responsible for sign in/out, but does not introduce an authentication bypass.
Specific Go Packages Affected
github.com/pomerium/pomerium/authenticate
Patches
Patched in v0.13.4
For more information
If you have any questions or comments about this advisory
- Open an issue in pomerium
- Email us at [email protected]
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/pomerium/pomerium | ≥ 0.10.0&&< 0.13.4 | 0.13.4 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/pomerium/pomerium. 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/pomerium/pomerium to 0.13.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-fv82-r8qv-ch4v 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-fv82-r8qv-ch4v 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-fv82-r8qv-ch4v. 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-fv82-r8qv-ch4v in your dependencies?
O3 detects GHSA-fv82-r8qv-ch4v across Go dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.