CVE-2026-115778
highTwisted is an event-based framework for internet applications, supporting Python 3.6+.
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/twisted/twisted/commit/073ba878c6c07d569cb61abc5ae76d46eff1b529 security-advisories@github.com
- https://github.com/twisted/twisted/commit/5d91cc66a3591faba758a80a1479e0103602facc security-advisories@github.com
- https://github.com/twisted/twisted/pull/12750 security-advisories@github.com
- https://github.com/twisted/twisted/releases/tag/twisted-26.10.0rc1 security-advisories@github.com
- https://github.com/twisted/twisted/security/advisories/GHSA-cwm5-jh59-mwxr security-advisories@github.com