CVE-2026-115776highCWE-400CWE-770

CVE-2026-115776: high-severity vulnerability in twisted

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

Published · Updated

Follow this CVE+ Monitor twisted+ Monitor twisted

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.5epss 0.5%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
twisted · twisted
Related CVEs — twisted

In the same product, most dangerous first.

CVE-2022-21716HIGHBuffer Overflow in TwistedEPSS 3.5%CVE-2022-24801HIGHHTTP Request Smuggling in twisted.webEPSS 2.8%CVE-2022-39348MEDIUMTwisted vulnerable to NameVirtualHost Host header injectionEPSS 1.6%CVE-2022-21712HIGHCookie and header exposure in twistedEPSS 1.4%CVE-2024-41810MEDIUMHTML injection in HTTP redirect bodyEPSS 1.2%CVE-2023-46137MEDIUMtwisted.web has disordered HTTP pipeline responseEPSS 0.9%