PatchTheCVECVE-2026-42304: Twisted is an event-based framework for internet applications, supporting Python 3.6+
CVE-2026-42304 is a high-severity flaw (CVSS 7.5) affecting twisted. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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-threade
Why this priority
- High severity
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-42304?
twisted: upgrade to 26.4.0. Exact commands for each OS are on this page.
Is CVE-2026-42304 being exploited?
CVE-2026-42304 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-42304 affect?
CVE-2026-42304 affects twisted. Severity is high (CVSS 7.5). 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 r
How urgent is CVE-2026-42304?
Priority 46/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action