CVE-2026-85078
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
- 6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - EPSS
- 0.5% chance of exploitation in the next 30 days; higher than 43% of CVEs (scores of 2026-10-25)
- CWE
- CWE-444
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-wmj6-g64g-j7q5 | PyPI | sanic | <24.12.1 | 24.12.1 |
| GHSA-wmj6-g64g-j7q5 | PyPI | sanic | >=25.12.0 <25.12.1 | 25.12.1 |
| PYSEC-2026-4162 | PyPI | sanic | <24.12.1 >=25.12.0 <25.12.1 | 24.12.1, 25.12.1 |
References
- https://github.com/sanic-org/sanic/commit/47349d689d65fa1907977ac100e867894aeafb22
- https://github.com/sanic-org/sanic/commit/69a10d3b06babaa9e5f6d1af577364e9e53b6dea
- https://github.com/sanic-org/sanic/commit/a332796506c7c588b6930b02a8886e43eb8ea8d6
- https://github.com/sanic-org/sanic/pull/3164
- https://github.com/sanic-org/sanic/pull/3165