๐Ÿ›ก๏ธ CVE-2026-42304
๐ŸŸ  CVSS 8.0 โ€” High โœ… No Known Exploit CWE-400 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-400
Public Exploit โœ… No
Source NVD
Published 2026-05-05
Updated 2026-06-15
Modified 2026-06-08
Fix URL N/A

Affected Packages

Software From version Fixed in
twisted โ€” 26.4.0rc2
unknown โ€” โ€”

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