cve-2026-2291

CVE-2026-2291 is a May 2026 vulnerability in the dnsmasq DNS parsing code, specifically in the extract_name() function, which can enable cache poisoning or denial of service in affected Linux and embedded resolver deployments. While Microsoft's Security Update Guide carries the record, no Windows patch is shipped, as the issue affects dnsmasq, not Windows itself. This distinction matters for IT teams managing Windows-hybrid environments, where name resolution can become intermittently unreliable or subtly wrong. The risk is not a widespread internet outage but operational disruption from compromised DNS responses. Discussions on WindowsForum focus on understanding the advisory's scope, patching strategies for mixed environments, and monitoring for signs of cache poisoning.