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.

suse_linux SUSE-SU-2026:5215-1: SUSE SLED15 / SLES15 : Security update for python-Twisted (Important) (SUSE-SU-2026:5215-1)

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-3385 advisory.

    A flaw was found in Twisted. An unauthenticated remote attacker can cause a Denial of Service (DoS) by     exhausting server memory. The issue occurs because the XML stream parser retains unfinished elements in     memory without enforcing size or element count limits. By transmitting a continuous stream of child     elements within an unclosed container during pre-authentication communication, an attacker can crash the     server process. (CVE-2026-115775)

    A flaw was found in Twisted. The Internet Relay Chat (IRC) protocol implementation does not enforce a     maximum line length when buffering incoming connection data. An unauthenticated remote attacker can     exploit this by sending a continuous stream of data without line feed characters to an IRC service. This     causes the server process to consume excessive memory until it runs out of resources, resulting in a     Denial of Service (DoS) that terminates connections for all users. (CVE-2026-115776)

    A flaw was found in Twisted. The Telnet service implementation fails to enforce a size limit on incoming     data buffers during protocol option negotiation, which occurs before user authentication. An     unauthenticated remote attacker can exploit this vulnerability by sending a continuous stream of     subnegotiation data without a terminating delimiter. This causes unbounded memory consumption that can     crash the application, resulting in a Denial of Service (DoS). (CVE-2026-115778)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of python-twisted-words installed on the remote host is prior to 12.2.0-4. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-4074 advisory.

    A flaw was found in Twisted. An unauthenticated remote attacker can cause a Denial of Service (DoS) by     exhausting server memory. The issue occurs because the XML stream parser retains unfinished elements in     memory without enforcing size or element count limits. By transmitting a continuous stream of child     elements within an unclosed container during pre-authentication communication, an attacker can crash the     server process. (CVE-2026-115775)

    A flaw was found in Twisted. The Internet Relay Chat (IRC) protocol implementation does not enforce a     maximum line length when buffering incoming connection data. An unauthenticated remote attacker can     exploit this by sending a continuous stream of data without line feed characters to an IRC service. This     causes the server process to consume excessive memory until it runs out of resources, resulting in a     Denial of Service (DoS) that terminates connections for all users. (CVE-2026-115776)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-115776)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-115776)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
377965	Amazon Linux 2023 : python3-twisted, python3-twisted+tls (ALAS2023-2026-3385)	Nessus	Amazon Linux Local Security Checks	Local	high
377949	Amazon Linux 2 : python-twisted-words (ALAS-2026-4074)	Nessus	Amazon Linux Local Security Checks	Local	high
478040	Chainguard: synapse: security update to 1.164.1-r2	Tenable Cloud Security	Chainguard Local Security Checks	Local	high
478040	Chainguard: synapse: security update to 1.164.1-r2	Tenable Self-Hosted Container Security	Chainguard Local Security Checks	Local	high
477261	SCA: security update for Twisted (GHSA-53xc-49m8-p798)	Tenable Cloud Security	SCA Checks	Local	high
477261	SCA: security update for Twisted (GHSA-53xc-49m8-p798)	Tenable Self-Hosted Container Security	SCA Checks	Local	high
371717	Linux Distros Unpatched Vulnerability : CVE-2026-115776	Nessus	Misc.	Local	high

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