Log in Start free

Vulnerability · Published Oct 23, 2026 · Assigned by GitHub_M

CVE-2026-115775Twisted: Unauthenticated Remote Denial of Service in the Twisted words domish XML Element Stream via an Unbounded Element Tree

High 8.7

In plain English

A high-severity uncontrolled resource consumption in twisted from twisted. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.7High
Exploit odds (30 days)0.4%top 61.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12twistedno fix listedDEBIAN-CVE-2026-115775
Debian:13twistedno fix listedDEBIAN-CVE-2026-115775
Debian:14twisted26.10.0-1DEBIAN-CVE-2026-115775
PyPItwisted26.10.0rc1GHSA-3476-c5c2-fr73
Ubuntu:22.04:LTStwistedno fix listedUBUNTU-CVE-2026-115775
Ubuntu:24.04:LTStwistedno fix listedUBUNTU-CVE-2026-115775
Ubuntu:26.04:LTStwistedno fix listedUBUNTU-CVE-2026-115775
Ubuntu:26.10twistedno fix listedUBUNTU-CVE-2026-115775

Affected products (as reported)

VendorProductVersions
twisted twisted < 26.10.0rc1

Weakness: CWE-400, CWE-770 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References