Bug 2560179 (CVE-2026-115776) - CVE-2026-115776 twisted: Twisted: Denial of Service via unbounded IRC buffer
Summary: CVE-2026-115776 twisted: Twisted: Denial of Service via unbounded IRC buffer
Keywords:
Status: NEW
Alias: CVE-2026-115776
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-23 20:31 UTC by OSIDB Bzimport
Modified: 2026-10-23 20:37 UTC (History)
18 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-10-23 20:31:47 UTC 
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.
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