CVE-2026-115775 Twisted: Unauthenticated Remote Denial of Service in the Twisted words domish XML Element Stream via an Unbounded Element Tree
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-115775?
CVE-2026-115775 is a high-severity vulnerability in twisted, published on 23 Oct 2026.
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.
Which versions are affected by CVE-2026-115775?
2 open source packages ship an affected version, including Twisted and twisted.
| Package | Affected | Fixed in |
|---|---|---|
Twisted PyPI | All versions | 26.10.0rc1 |
twisted PyPI | All versions | 26.10.0rc1 |
How do I fix CVE-2026-115775?
Upgrade Twisted to 26.10.0rc1 or later.
Is CVE-2026-115775 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-115775 exists.
Sources
Also known as AZL-111422, DEBIAN-CVE-2026-115775, ECHO-6041-69ad-171d, GHSA-3476-c5c2-fr73, UBUNTU-CVE-2026-115775.