CVE-2026-115776

High

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.

SeverityHigh

CVSS7.5

Exploit probability—

Product

Twisted

PublishedOct 23, 2026

First seenOct 23, 2026

Weakness typeCWE-400Uncontrolled resource consumption CWE-770Allocation of resources without limits

How to fix

Update

twisted26.10.0rc1 or later

Affected products

Product	Affected versions	Fixed in
twistedPyPI	v < 26.10.0rc1	26.10.0rc1
microsoft azl3_python-twisted_22.10.0-6	No range specified	—
microsoft azl3_python-twisted_22.10.0-7	No range specified	—

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