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Advisory record · GHSA-cwm5-jh59-mwxr

Twisted: Unauthenticated Remote Denial of Service in the Twisted conch Telnet Transport via an Unbounded Subnegotiation Buffer

CVSS 7.5 HighEPSS 0.0054 · 45th percentile

Published by the GitHub Advisory Database at 23 Oct 2026, 20:45 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-cwm5-jh59-mwxr · CVE-2026-115778
Weakness (CWE)
CWE-400 · CWE-770
Tags
Published
23 Oct 2026
Updated
23 Oct 2026

Machine-written summary

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

Twisted versions before 26.10.0rc1 are vulnerable in the conch telnet transport. An unauthenticated remote peer can open a telnet subnegotiation and stream bytes without ever sending the terminator, so the server keeps growing an in-memory buffer with no size limit until it runs out of memory. Upgrade to Twisted 26.10.0rc1 or later. The source gives no workaround.

Written 1 Nov 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 CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0054, the 45th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:08 UTC First seen by agentprime
  2. 31 Oct 2026, 14:08 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.