CVE-2026-42304

Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.4.0rc2, the twisted.names module is vulnerable to a Denial of Service (DoS) attack via resource exhaustion during DNS name decompression. A remote, unauthenticated attacker can exploit this by sending a crafted TCP DNS packet containing deeply chained compression pointers. This flaw bypasses previous loop-prevention logic, causing the single-threaded Twisted reactor to hang while processing millions of recursive lookups, effectively freezing the server. This vulnerability is fixed in 26.4.0rc2.

• CWE-400
• CWE-407

• https://github.com/twisted/twisted/security/advisories/GHSA-grgv-6hw6-v9g4Exploit, Mitigation, Vendor Advisory
• https://github.com/twisted/twisted/security/advisories/GHSA-grgv-6hw6-v9g4Exploit, Mitigation, Vendor Advisory

Published

May 13, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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