CVEvulnerability
CVE-2026-115778
7.5 HIGH
Official page ↗
- Status
- Awaiting Analysis
- Published
- 2026-10-23
- Last modified
- 2026-10-26
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-400, CWE-770
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.
Related
References
- https://github.com/twisted/twisted/commit/073ba878c6c07d569cb61abc5ae76d46eff1b529 github.com
- https://github.com/twisted/twisted/commit/5d91cc66a3591faba758a80a1479e0103602facc github.com
- https://github.com/twisted/twisted/pull/12750 github.com
- https://github.com/twisted/twisted/releases/tag/twisted-26.10.0rc1 github.com
- https://github.com/twisted/twisted/security/advisories/GHSA-cwm5-jh59-mwxr github.com