CVE-2026-42304
HIGH EPSS 34.7%
Published May 13, 20261mo ago · Modified Jun 17, 20261w ago
7.5 CVSS 3.1
Published May 13, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High
Threat Intelligence
EPSS Exploit Probability
34.7% percentile
Exploit & Patch Status
Public Exploit Known
No Patch Available
Weaknesses 2
CWE-400 Uncontrolled Resource Consumption Resource Mgmt
CWE-407
Affected Products 2
References 1
- github.com https://github.com/twisted/twisted/security/advisories/GHSA-grgv-6hw6-v9g4
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.