CVE-2022-35920 — Sanic is an opensource python web server/framework

Sanic is an opensource python web server/framework. Affected versions of sanic allow access to lateral directories when using `app.static` if using encoded `%2F` URLs. Parent directory traversal is not impacted. Users are advised to upgrade. There is no known workaround for this

01What is this vulnerability?

Sanic is an opensource python web server/framework. Affected versions of sanic allow access to lateral directories when using `app.static` if using encoded `%2F` URLs. Parent directory traversal is not impacted. Users are advised to upgrade. There is no known workaround for this issue.

02Affected products

Vendor	Product	Versions
sanic-org	sanic	>= 22.0.0, < 22.6.1, >= 21.0.0, < 21.12.2, < 20.12.7

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2022-08-01T21:35:27.000Z
• Last modified: 2025-04-22T17:45:43.669Z

09References

• github.com — https://github.com/sanic-org/sanic/security/advisories/GHSA-8cw9-5hmv-77w6
• github.com — https://github.com/sanic-org/sanic/issues/2478
• github.com — https://github.com/sanic-org/sanic/pull/2495