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CVE-2026-115776

CVE-2026-115776 · Twisted: Unauthenticated Remote Denial of Service in the Twisted IRC Server via an Unbounded Line Buffer

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 7.5 · High · Public exploit · Fix available

Published
Updated

Stack: python

Affected products and versions

  • twisted

    Versions
    • < 26.10.0rc1: Affected

    No fix published

  • twisted PyPI

    Versions
    • 1.0.1
    • 1.0.3
    • 1.0.4
    • 1.0.5
    • 1.0.6
    • 1.0.7
    • 1.1.0
    • 1.1.1
    • 1.2.0
    • 10.0.0
    • 10.1.0
    • 10.2.0
    • 11.0.0
    • 11.1.0
    • 12.0.0
    • 12.1.0
    • 12.2.0
    • 12.3.0
    • 13.0.0
    • 13.1.0
    • 13.2.0
    • 14.0.0
    • 14.0.1
    • 14.0.2
    • 15.0.0
    • 15.1.0
    • 15.2.0
    • 15.2.1
    • 15.3.0
    • 15.4.0
    • 15.5.0
    • 16.0.0
    • 16.1.0
    • 16.1.1
    • 16.2.0
    • 16.3.0
    • 16.3.1
    • 16.3.2
    • 16.4.0
    • 16.4.1
    • 16.5.0
    • 16.5.0rc1
    • 16.5.0rc2
    • 16.6.0
    • 16.6.0rc1
    • 16.7.0rc1
    • 16.7.0rc2
    • 17.1.0
    • 17.1.0rc1
    • 17.5.0
    • 17.9.0
    • 17.9.0rc1
    • 18.4.0
    • 18.4.0rc1
    • 18.7.0
    • 18.7.0rc1
    • 18.7.0rc2
    • 18.9.0
    • 18.9.0rc1
    • 19.10.0
    • 19.10.0rc1
    • 19.2.0
    • 19.2.0rc1
    • 19.2.0rc2
    • 19.2.1
    • 19.7.0
    • 19.7.0rc1
    • 2.1.0
    • 2.4.0
    • 2.5.0
    • 20.3.0
    • 20.3.0rc1
    • 21.2.0
    • 21.2.0rc1
    • 21.7.0
    • 21.7.0rc1
    • 21.7.0rc2
    • 21.7.0rc3
    • 22.1.0
    • 22.1.0rc1
    • 22.10.0
    • 22.10.0rc1
    • 22.2.0
    • 22.2.0rc1
    • 22.4.0
    • 22.4.0rc1
    • 22.8.0
    • 22.8.0rc1
    • 23.10.0
    • 23.10.0rc1
    • 23.8.0
    • 23.8.0rc1
    • 24.10.0
    • 24.10.0rc1
    • 24.11.0
    • 24.11.0rc1
    • 24.11.0rc2
    • 24.2.0rc1
    • 24.3.0
    • 24.7.0
    • 24.7.0rc1
    • 24.7.0rc2
    • 25.5.0
    • 25.5.0rc1
    • 26.4.0
    • 26.4.0rc2
    • 8.0.0
    • 8.0.1
    • 8.1.0
    • 8.2.0
    • 9.0.0
    Affected ranges
    • ECOSYSTEM: < 26.10.0rc1

    Update to 26.10.0rc1

Original sources

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