{"id":"CVE-2026-85078","state":"PUBLISHED","title":"sanic chunked trailer request smuggling allows hidden second request execution","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.","publishedAt":"2026-09-17T14:28:37.286Z","updatedAt":"2026-09-17T19:19:53.849Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["sanic-org sanic"],"affected":[{"vendor":"sanic-org","product":"sanic","versions":[{"version":"< 24.12.1","status":"affected"},{"version":">= 25.12.0, < 25.12.1","status":"affected"}]}],"references":["https://github.com/sanic-org/sanic/security/advisories/GHSA-wmj6-g64g-j7q5","https://github.com/sanic-org/sanic/pull/3164","https://github.com/sanic-org/sanic/pull/3165","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/releases/tag/v24.12.1","https://github.com/sanic-org/sanic/releases/tag/v25.12.1"],"weaknesses":["CWE-444"],"ingestedAt":"2026-10-29T20:13:15.269Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/85xxx/CVE-2026-85078.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-85078","state":"PUBLISHED","datePublished":"2026-09-17T14:28:37.286Z","dateUpdated":"2026-09-17T19:19:53.849Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-09-02T21:21:01.776Z"},"containers":{"cna":{"title":"sanic chunked trailer request smuggling allows hidden second request execution","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"sanic-org","product":"sanic","versions":[{"version":"< 24.12.1","status":"affected"},{"version":">= 25.12.0, < 25.12.1","status":"affected"}]}],"references":[{"url":"https://github.com/sanic-org/sanic/security/advisories/GHSA-wmj6-g64g-j7q5","name":"https://github.com/sanic-org/sanic/security/advisories/GHSA-wmj6-g64g-j7q5","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/sanic-org/sanic/pull/3164","name":"https://github.com/sanic-org/sanic/pull/3164","tags":["x_refsource_MISC"]},{"url":"https://github.com/sanic-org/sanic/pull/3165","name":"https://github.com/sanic-org/sanic/pull/3165","tags":["x_refsource_MISC"]},{"url":"https://github.com/sanic-org/sanic/commit/47349d689d65fa1907977ac100e867894aeafb22","name":"https://github.com/sanic-org/sanic/commit/47349d689d65fa1907977ac100e867894aeafb22","tags":["x_refsource_MISC"]},{"url":"https://github.com/sanic-org/sanic/commit/69a10d3b06babaa9e5f6d1af577364e9e53b6dea","name":"https://github.com/sanic-org/sanic/commit/69a10d3b06babaa9e5f6d1af577364e9e53b6dea","tags":["x_refsource_MISC"]},{"url":"https://github.com/sanic-org/sanic/commit/a332796506c7c588b6930b02a8886e43eb8ea8d6","name":"https://github.com/sanic-org/sanic/commit/a332796506c7c588b6930b02a8886e43eb8ea8d6","tags":["x_refsource_MISC"]},{"url":"https://github.com/sanic-org/sanic/releases/tag/v24.12.1","name":"https://github.com/sanic-org/sanic/releases/tag/v24.12.1","tags":["x_refsource_MISC"]},{"url":"https://github.com/sanic-org/sanic/releases/tag/v25.12.1","name":"https://github.com/sanic-org/sanic/releases/tag/v25.12.1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-444","lang":"en","description":"CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-17T14:28:37.286Z"},"source":{"advisory":"GHSA-wmj6-g64g-j7q5","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-17T17:06:16.358452Z","id":"CVE-2026-85078","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-17T19:19:53.849Z"}}]}}}