Summary
Package updates are available for Amazon Linux 2 that fix the following vulnerabilities: CVE-2026-115776: 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-2026-115775: 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.
Fixed packages 1
| Release | Package | Fixed in |
|---|---|---|
| Amazon Linux · 2 | python-twisted-words | 0:12.2.0-4.amzn2.0.3 |
Vulnerabilities 2
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High 8.7
Twisted: Unauthenticated Remote Denial of Service in the Twisted words domish XML Element Stream via an Unbounded Element Tree
Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.10.0rc1, the twisted.words.xish.domish ExpatElementStream parser allows an unauthenticated remote peer to keep a container element open while continuously addin…
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High 7.5
Twisted: Unauthenticated Remote Denial of Service in the Twisted IRC Server via an Unbounded Line Buffer
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 le…