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.
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Thu, 14 May 2026 16:30:00 +0000
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Wed, 13 May 2026 22:45:00 +0000
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| 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. | |
| Title | Twisted: Denial of Service (DoS) in twisted.names via Crafted DNS Compression Pointer Chains | |
| Weaknesses | CWE-400 CWE-407 |
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cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-05-14T15:45:34.746Z
Reserved: 2026-04-26T12:13:55.552Z
Link: CVE-2026-42304
Updated: 2026-05-14T15:45:21.220Z
Status : Awaiting Analysis
Published: 2026-05-13T21:16:46.933
Modified: 2026-05-14T18:12:13.527
Link: CVE-2026-42304
No data.
OpenCVE Enrichment
Updated: 2026-05-13T22:30:05Z