CVE-2026-42304

7.5 HIGH

Twisted is an event-based framework for internet applications, supporting Python 3.6+

Published: 2026-05-13 · Last updated: 2026-05-19

Severity and scoring

CVSS: 7.5 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE: CWE-400, CWE-407

Affected products

Vendor	Product
twisted	twisted

Description

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.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-42304
[Vendor advisory]https://github.com/twisted/twisted/security/advisories/GHSA-grgv-6hw6-v9g4
[Vendor advisory]https://github.com/twisted/twisted/security/advisories/GHSA-grgv-6hw6-v9g4

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