GHSA-3mwg-gp5g-fv3q
MEDIUMGHSA-3mwg-gp5g-fv3q is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in feedparser. 4 public exploit references exist, so weaponization risk is real. O3 Security confirms whether GHSA-3mwg-gp5g-fv3q is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
feedparser Cross-site Scripting vulnerability
Real-World Exposure
feedparserReal-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
Cross-site scripting (XSS) vulnerability in feedparser.py in Universal Feed Parser (aka feedparser or python-feedparser) before 5.0 allows remote attackers to inject arbitrary web script or HTML via vectors involving nested CDATA stanzas.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | feedparser | all versions | 5.0 |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
python-feedparser 5.0 - '/feedparser/feedparser.py' Cross-Site Scripting
by fazalmajid · Apr 5, 2011
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for feedparser. 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 feedparser to 5.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-3mwg-gp5g-fv3q 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-3mwg-gp5g-fv3q 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-3mwg-gp5g-fv3q. 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-3mwg-gp5g-fv3q in your dependencies?
O3 detects GHSA-3mwg-gp5g-fv3q across PyPI dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.