GHSA-7vwr-g6pm-9hc8 is a high-severity (CVSS 7.5) vulnerability in fastapi-proxy-lib. A fix is available for fastapi-proxy-lib — see the affected versions and patch details below.
Cookie leakage between different users in fastapi-proxy-lib
Real-World Exposure
fastapi-proxy-libReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.
Description
Impact
In the implementation of version 0.0.1, requests from different user clients are processed using a shared httpx.AsyncClient.
However, one oversight is that the httpx.AsyncClient will persistently store cookies based on the set-cookie response header sent by the target server and share these cookies across different user requests.
This results in a cookie leakage issue among all user clients sharing the same httpx.AsyncClient.
Patches
It's fixed in 0.1.0
Workarounds
If you insist 0.0.1:
- Do not use
ForwardHttpProxyat all. - Do not use
ReverseHttpProxyorReverseWebSocketProxyfor any servers that may potentially send aset-cookieresponse.
However, it's best to upgrade to the latest version.
References
fixed in #10
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | fastapi-proxy-lib | all versions | 0.1.0pip install --upgrade 'fastapi-proxy-lib==0.1.0' |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for fastapi-proxy-lib, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update fastapi-proxy-lib to 0.1.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-7vwr-g6pm-9hc8 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 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-7vwr-g6pm-9hc8 can be triaged on real exposure rather than presence alone.
Tailored to GHSA-7vwr-g6pm-9hc8. 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-7vwr-g6pm-9hc8 in your dependencies?
O3 Security finds GHSA-7vwr-g6pm-9hc8 across PyPI dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.