CVE-2026-27854 — Use after free when parsing EDNS options in Lua

CVE-2026-27854

Use after free when parsing EDNS options in Lua PUBLISHED

Description (CNA)

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 (CNA)

Vendor / product	Versions
PowerDNS / DNSdist	affected 1.9.0 before 1.9.12; affected 2.0.0 before 2.0.3

CWE

No CWE identifiers supplied.

References

https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-02.html

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.