GHSA-8cw9-5hmv-77w6 is a high-severity (CVSS 8.3) Path Traversal vulnerability in sanic. 1 public exploit reference exists, so weaponization risk is real. A fix is available for sanic — see the affected versions and patch details below.
sanic vulnerable to Path Traversal when using `app.static` if using encoded `%2F` URLs
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
Exploitation and automatability from CISA’s SSVC triage for GHSA-8cw9-5hmv-77w6.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
GHSA-8cw9-5hmv-77w6 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 377,166 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
sanic🐍sanic🐍sanicReal-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
Access to lateral directories when using app.static if using encoded %2F URLs. Parent directory traversal is not impacted.
Patches
- v20.12.7 (LTS)
- v21.12.2 (LTS)
- v22.6.1
References
https://github.com/sanic-org/sanic/issues/2478 https://github.com/sanic-org/sanic/pull/2495
For more information
If you have any questions or comments about this advisory:
- Open an issue in the community forums
- Ping us on the Discord server
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | sanic | ≥ 22.0.0&&< 22.6.1 | 22.6.1pip install --upgrade 'sanic==22.6.1' |
| 🐍PyPI | sanic | ≥ 21.0.0&&< 21.12.2 | 21.12.2pip install --upgrade 'sanic==21.12.2' |
| 🐍PyPI | sanic | all versions | 20.12.7pip install --upgrade 'sanic==20.12.7' |
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 sanic, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update sanic to 22.6.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-8cw9-5hmv-77w6 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-8cw9-5hmv-77w6 can be triaged on real exposure rather than presence alone.
Tailored to GHSA-8cw9-5hmv-77w6. 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-8cw9-5hmv-77w6 in your dependencies?
O3 Security finds GHSA-8cw9-5hmv-77w6 across PyPI dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.