---
id: CVE-2026-115775
title: >-
  Twisted: Unauthenticated Remote Denial of Service in the Twisted words domish
  XML Element Stream via an Unbounded Element Tree
summary: >-
  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 wh…
severity: high
cvss: 8.7
cvssVector: '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'
cvssSource: cna
cwe:
  - CWE-400
  - CWE-770
vendor: twisted
product: twisted
affected:
  - twisted < 26.10.0rc1
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-29T18:13:46.702578Z'
exploitAvailable: true
published: '2026-10-23'
updated: '2026-10-29'
sourceUpdated: '2026-10-29T18:14:18.997Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-115775'
references:
  - url: 'https://github.com/twisted/twisted/security/advisories/GHSA-3476-c5c2-fr73'
    label: 'https://github.com/twisted/twisted/security/advisories/GHSA-3476-c5c2-fr73'
  - url: 'https://github.com/twisted/twisted/pull/12751'
    label: 'https://github.com/twisted/twisted/pull/12751'
  - url: >-
      https://github.com/twisted/twisted/commit/8873814bec8288e2466fad4d2c4d64039beb88b0
    label: >-
      https://github.com/twisted/twisted/commit/8873814bec8288e2466fad4d2c4d64039beb88b0
  - url: 'https://github.com/twisted/twisted/releases/tag/twisted-26.10.0rc1'
    label: 'https://github.com/twisted/twisted/releases/tag/twisted-26.10.0rc1'
  - url: 'https://github.com/twisted/twisted'
  - url: 'https://github.com/advisories/GHSA-3476-c5c2-fr73'
tags:
  - cve.org
  - exploit-available
  - osv
  - pip
  - ghsa
epss: 0.00444
epssPercentile: 0.38714
aliases:
  - GHSA-3476-c5c2-fr73
ecosystem: pip
patched:
  - twisted 26.10.0rc1
ingestedAt: '2026-10-23T20:36:51.530Z'
---

## Overview

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

- `twisted < 26.10.0rc1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-115775)

Affected packages:

- `twisted < 26.10.0rc1`

Patched in:

- `twisted 26.10.0rc1`

Source: https://osv.dev/vulnerability/GHSA-3476-c5c2-fr73