cve 2026-42304

CVE-2026-42304 is a high-severity denial-of-service vulnerability in Twisted's twisted.names DNS code, disclosed in late April 2026. An unauthenticated remote attacker can exploit it with a crafted TCP DNS packet to stall vulnerable services. While not a Windows flaw, it affects Python infrastructure, developer tooling, automation stacks, and internal services that cross the Windows-Linux boundary. The vulnerability is tracked by Microsoft's Security Update Guide, and the fix is to upgrade to Twisted 26.4.0. This tag covers discussions about the vulnerability, its impact on Windows environments, and mitigation steps.