CVE-2026-85078
mediumSanic is an opensource python web server/framework.
Sanic is an opensource python web server/framework. In version 25.12.0, Sanic's core HTTP/1.1 chunked-body handling does not fully consume the trailer-part after the terminating zero chunk before reusing the keep-alive connection buffer. A remote unauthenticated client can place attacker-controlled bytes in that trailer region, causing Sanic to parse and route them as a hidden second request after the outer request. This breaks HTTP request-boundary integrity and can provide a request-smuggling primitive when Sanic is deployed behind intermediaries. This issue is fixed in version 25.12.1.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/sanic-org/sanic/commit/47349d689d65fa1907977ac100e867894aeafb22 security-advisories@github.com
- https://github.com/sanic-org/sanic/commit/69a10d3b06babaa9e5f6d1af577364e9e53b6dea security-advisories@github.com
- https://github.com/sanic-org/sanic/commit/a332796506c7c588b6930b02a8886e43eb8ea8d6 security-advisories@github.com
- https://github.com/sanic-org/sanic/pull/3164 security-advisories@github.com
- https://github.com/sanic-org/sanic/pull/3165 security-advisories@github.com
- https://github.com/sanic-org/sanic/releases/tag/v24.12.1 security-advisories@github.com
- https://github.com/sanic-org/sanic/releases/tag/v25.12.1 security-advisories@github.com
- https://github.com/sanic-org/sanic/security/advisories/GHSA-wmj6-g64g-j7q5 security-advisories@github.com