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Advisory record · GHSA-vpp8-g58w-m8mp

Twisted: Unauthenticated Remote Denial of Service in the Twisted HTTP/2 Server via Rapid Stream Reset

CVSS 7.5 High

Published by the GitHub Advisory Database at 29 Oct 2026, 16:41 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
twistedPyPI<26.10.0rc126.10.0rc1
Identifiers
GHSA-vpp8-g58w-m8mp
Weakness (CWE)
CWE-400 · CWE-770
Tags
Published
29 Oct 2026
Updated
29 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Twisted's HTTP/2 server, in versions before 26.10.0rc1, is vulnerable to a denial of service: an unauthenticated remote client can open one connection, send request headers with END_STREAM and immediately reset the stream, and repeat this so the server renders each request and consumes CPU. The attack needs only network access to a Twisted HTTP/2 endpoint and no credentials, and the source says it can saturate a CPU core over a single connection. The fix is to upgrade to Twisted 26.10.0rc1 or later.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS No score.

Timeline

  1. 31 Oct 2026, 14:07 UTC First seen by agentprime
  2. 31 Oct 2026, 14:07 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.