GHSA-8g9m-vv69-7j99 is a medium-severity (CVSS 6.1) Open Redirect vulnerability in rdiffweb. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for rdiffweb — see the affected versions and patch details below.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
rdiffwebReal-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
A lack of user input validation leads to an open redirect vulnerability in rdiffweb prior to 2.5.0a4.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | rdiffweb | all versions | 2.5.0a4pip install --upgrade 'rdiffweb==2.5.0a4' |
Affected Products
rdiffwebikus-softResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for rdiffweb, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update rdiffweb to 2.5.0a4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-8g9m-vv69-7j99 is resolved across your whole dependency graph.
Workarounds
Stop reflecting attacker-controlled destinations: resolve every redirect target against an allowlist of paths or hosts you own, prefer a server-side key over a full URL in the request, and reject absolute URLs entirely where the flow only ever needs a relative one.
Frequently Asked Questions
Is GHSA-8g9m-vv69-7j99 in your dependencies?
Find it across PyPI, including transitive dependencies.