{"id":"CVE-2026-115877","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-115877","generatedAt":"2026-10-28T01:41:22.555Z","title":"The resulting framing disagreement can smuggle a following request past front-end access controls, poison a shared connection or cache, and expose a later client to the wrong response.","description":"Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.10.0rc1, twisted.web.http.HTTPChannel.headerReceived rejects a NUL byte in an HTTP header value but accepts a bare carriage return or bare line feed. Because Twisted splits header lines only on CRLF, a hidden Content-Length header can remain folded into another value while a lenient front end treats the bare character as a line terminator. The resulting framing disagreement can smuggle a following request past front-end access controls, poison a shared connection or cache, and expose a later client to the wrong response. This issue is an incomplete-fix residual of earlier Twisted request-smuggling protections. This issue is fixed in version 26.10.0rc1.","published":"2026-10-23T21:17:24.000Z","lastModified":"2026-10-26T14:05:17.000Z","status":"Awaiting Analysis","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":5.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N"},"cwe":["CWE-444"],"affected":[],"epss":{"score":0.00257,"percentile":0.1716,"date":"2026-10-26","history":[{"date":"2026-10-24","score":0.00326,"percentile":0.24487}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.26%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-23T21:17:24.000Z","detail":{"score":"5.4","severity":"MEDIUM","publishedAt":"2026-10-23T21:17:23.643Z"},"summary":"New CVE, medium severity (CVSS 5.4)."}],"references":[{"url":"https://github.com/twisted/twisted/commit/022b6f7feb5980166c71f54e2c0d8f4f21ff6e1a","source":"security-advisories@github.com"},{"url":"https://github.com/twisted/twisted/commit/1616f702d36eda8990a5a5b22ad70fab140a7eb1","source":"security-advisories@github.com"},{"url":"https://github.com/twisted/twisted/pull/12755","source":"security-advisories@github.com"},{"url":"https://github.com/twisted/twisted/releases/tag/twisted-26.10.0rc1","source":"security-advisories@github.com"},{"url":"https://github.com/twisted/twisted/security/advisories/GHSA-q7qq-6mhp-9rc4","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-115877","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}