Detections
Analytics
CVE-2026-115778
high
Description
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.
References
https://github.com/twisted/twisted/security/advisories/GHSA-cwm5-jh59-mwxr
https://github.com/twisted/twisted/releases/tag/twisted-26.10.0rc1
https://github.com/twisted/twisted/pull/12750
https://github.com/twisted/twisted/commit/5d91cc66a3591faba758a80a1479e0103602facc
https://github.com/twisted/twisted/commit/073ba878c6c07d569cb61abc5ae76d46eff1b529