CVE-2026-27854: Powerdns Dnsdist

High severity, CVSS 7.5. EPSS: 1.3% chance of exploitation in the next 30 days.

An attacker might be able to trigger a use-after-free by sending crafted DNS queries to a DNSdist using the DNSQuestion:getEDNSOptions method in custom Lua code. In some cases DNSQuestion:getEDNSOptions might refer to a version of the DNS packet that has been modified, thus triggering a use-after-free and potentially a crash resulting in denial of service.

Affected products

• Powerdns Dnsdist: from 1.9.0, before 1.9.12 (fixed in 1.9.12); from 2.0.0, before 2.0.3 (fixed in 2.0.3)

Published 2026-03-31. Last modified 2026-07-25.