CVE-2026-115778

Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.10.0rc1, twisted.conch.telnet.Telnet.dataReceived appends every byte received after IAC SB to a persistent subnegotiation buffer until IAC SE is received, without applying a maximum length. Telnet option negotiation occurs before authentication, so an unauthenticated peer can omit the terminator and continuously grow the buffer. The resulting memory exhaustion can terminate the process and every service it hosts. This issue is fixed in version 26.10.0rc1.

• CWE-400
• CWE-770

• https://github.com/twisted/twisted/commit/073ba878c6c07d569cb61abc5ae76d46eff1b529
• https://github.com/twisted/twisted/commit/5d91cc66a3591faba758a80a1479e0103602facc
• https://github.com/twisted/twisted/pull/12750
• https://github.com/twisted/twisted/releases/tag/twisted-26.10.0rc1
• https://github.com/twisted/twisted/security/advisories/GHSA-cwm5-jh59-mwxr

Published

Oct 23, 2026

Last Modified

Oct 23, 2026

Status

Received

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-115754serialize-javascript from 7.0.1 before 7.1.3 contains a cros…4.7
• CVE-2026-11576The security fix for CVE-2025-0728 in eclipse-threadx NetX D…7.5
• CVE-2026-11577Rejected reason: The reported behavior does not constitute a…
• CVE-2026-115774Twisted is an event-based framework for internet application…4.9
• CVE-2026-115775Twisted is an event-based framework for internet application…8.7
• CVE-2026-115776Twisted is an event-based framework for internet application…7.5
• CVE-2026-11578The Fluent Forms WordPress plugin before 6.2.5 does not pro…2.7
• CVE-2026-115785An SMTP command injection vulnerability in the data-source t…4.3
• CVE-2026-115786A mailbox quota-accounting vulnerability in Zimbra Collabora…6.5
• CVE-2026-11579The Kali Forms — Contact Form & Drag-and-Drop Builder WordPr…5.3
• CVE-2026-115796A security flaw has been discovered in Tenda F6 12.02.01.73.…4.3
• CVE-2026-115797A weakness has been identified in Tenda F6 12.02.01.73. Affe…3.7