{"id":"DEBIAN-CVE-2026-115877","details":"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.","modified":"2026-10-24T13:00:06.973886585Z","published":"2026-10-23T21:17:23.643Z","upstream":["CVE-2026-115877"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-115877"}],"affected":[{"package":{"name":"twisted","ecosystem":"Debian:12","purl":"pkg:deb/debian/twisted?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["22.4.0-4","22.4.0-4+deb12u1","23.10.0-1","23.10.0-2","24.10.0-1","24.10.0-2","24.11.0-1","24.3.0-1","24.3.0-2","24.3.0-3","24.7.0-1","24.7.0-2","24.7.0-3","25.5.0-1","25.5.0-2","25.5.0-3","25.5.0-4","25.5.0-5","26.4.0-1","26.4.0-2","26.4.0-3","26.4.0-4","26.4.0-5","26.4.0-6"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-115877.json"}},{"package":{"name":"twisted","ecosystem":"Debian:13","purl":"pkg:deb/debian/twisted?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["24.11.0-1","25.5.0-1","25.5.0-2","25.5.0-3","25.5.0-4","25.5.0-5","26.4.0-1","26.4.0-2","26.4.0-3","26.4.0-4","26.4.0-5","26.4.0-6"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-115877.json"}},{"package":{"name":"twisted","ecosystem":"Debian:14","purl":"pkg:deb/debian/twisted?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["24.11.0-1","25.5.0-1","25.5.0-2","25.5.0-3","25.5.0-4","25.5.0-5","26.4.0-1","26.4.0-2","26.4.0-3","26.4.0-4","26.4.0-5","26.4.0-6"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-115877.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N"}]}