GHSA-8p5c-f328-9fvv is a critical-severity (CVSS 9.8) vulnerability in diffoscope. 1 public exploit reference exists, so weaponization risk is real. O3 Security confirms whether GHSA-8p5c-f328-9fvv is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Diffoscope may write to arbitrary locations due to an untrusted archive
Real-World Exposure
diffoscopeReal-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
diffoscope before 76 writes to arbitrary locations on disk based on the contents of an untrusted archive.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | diffoscope | all versions | 76 |
Research 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 diffoscope. 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 diffoscope to 76 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-8p5c-f328-9fvv 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-8p5c-f328-9fvv 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-8p5c-f328-9fvv. 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-8p5c-f328-9fvv in your dependencies?
O3 detects GHSA-8p5c-f328-9fvv across PyPI dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.