{"cve":"CVE-2026-85078","nvd":{"published":"2026-09-17T15:16:55.153","modified":"2026-09-30T17:31:44.573","status":"Awaiting Analysis","description":"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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","score":6.5},"cwes":["CWE-444"],"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"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:55:23.253742848+00:00"},"epss":{"cve":"CVE-2026-85078","score":0.00511,"percentile":0.4328,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-wmj6-g64g-j7q5","url":"https://osv.dev/vulnerability/GHSA-wmj6-g64g-j7q5","summary":"sanic chunked trailer request smuggling allows hidden second request execution","modified":"2026-10-01T17:56:08.144570975Z","packages":[{"ecosystem":"PyPI","name":"sanic","purl":"pkg:pypi/sanic","ranges":["<24.12.1"],"fixed":["24.12.1"]},{"ecosystem":"PyPI","name":"sanic","purl":"pkg:pypi/sanic","ranges":[">=25.12.0 <25.12.1"],"fixed":["25.12.1"]}]},{"id":"PYSEC-2026-4162","url":"https://osv.dev/vulnerability/PYSEC-2026-4162","summary":"sanic chunked trailer request smuggling allows hidden second request execution","modified":"2026-10-01T17:45:17.786358529Z","packages":[{"ecosystem":"PyPI","name":"sanic","purl":"pkg:pypi/sanic","ranges":["<24.12.1",">=25.12.0 <25.12.1"],"fixed":["24.12.1","25.12.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}