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

CVE-2026-115775 is fixed in 3 products on 1 platform, first by DEBIAN-CVE-2026-115775, released November 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-115775
- Priority: Routine
- CVSS: n/a (Moderate)
- EPSS: 0.0044
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 23, 2026
- Weakness: Uncontrolled Resource Consumption
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | python3-twisted amzn 2023 | 22.4.0-129.amzn2023.0.7 | [ALAS2023-2026-3385](https://patchblox.com/security/data/fix/linux/alas2023-2026-3385.md) | Nov 10, 2026 |
| Linux | python3-twisted+tls amzn 2023 | 22.4.0-129.amzn2023.0.7 | [ALAS2023-2026-3385](https://patchblox.com/security/data/fix/linux/alas2023-2026-3385.md) | Nov 10, 2026 |
| Linux | twisted Debian 14 | 26.10.0-1 | [DEBIAN-CVE-2026-115775](https://patchblox.com/security/data/fix/linux/debian-cve-2026-115775.md) | Nov 3, 2026 |

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Data as of 2026-11-10T07:50:38Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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