CVE-2026-115775

Name	CVE-2026-115775
Description	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 adding child elements. The parser retains the unfinished stanza as an in-memory tree without a byte or element-count limit, and XMPP pre-authentication stream parsing exposes this behavior before credentials are accepted. A single connection can therefore exhaust server memory and terminate the process. This issue is fixed in version 26.10.0rc1.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1151938

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
twisted (PTS)	bookworm, bookworm (security)	22.4.0-4+deb12u1	vulnerable
	trixie	24.11.0-1	vulnerable
	sid, forky	26.4.0-6	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
twisted	source	(unstable)	(unfixed)			1151938

Notes

[trixie] - twisted <no-dsa> (Minor issue)
https://github.com/twisted/twisted/security/advisories/GHSA-3476-c5c2-fr73
https://github.com/twisted/twisted/pull/12751
Fixed by: https://github.com/twisted/twisted/commit/8873814bec8288e2466fad4d2c4d64039beb88b0 (twisted-26.10.0rc1)