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[ CVE-2026-115776 · Published 23 Oct 2026 ]

Twisted: Unauthenticated Remote Denial of Service in the Twisted IRC Server via an Unbounded Line Buffer

CVSS 7.5 EPSS <1%Fix available

[ Description ]Official description

Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.10.0rc1, twisted.words.protocols.irc.IRC.dataReceived retains all bytes received without a line feed in its per-connection buffer and applies no maximum line length. The twisted.words.service.IRCUser server subclass inherits this behavior, and buffering occurs before PASS, NICK, or USER authentication commands. An unauthenticated connection can continuously grow the buffer until the shared server process runs out of memory and drops all users. This issue is fixed in version 26.10.0rc1.

[ Fixes ]Fixes and patches

  • Twisted 26.10.0rc1Fixed version · GitHub Advisories · pip package Twisted: upgrade to 26.10.0rc1 or later (affected <= 26.4.0)

[ Packages ]Affected open-source packages

[ References ]References