CVE-2026-27853

Name	CVE-2026-27853
Description	An attacker might be able to trigger an out-of-bounds write by sending crafted DNS responses to a DNSdist using the DNSQuestion:changeName or DNSResponse:changeName methods in custom Lua code. In some cases the rewritten packet might become larger than the initial response and even exceed 65535 bytes, potentially leading to a crash resulting in denial of service.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
dnsdist (PTS)	bullseye	1.5.1-3	vulnerable
	bookworm	1.7.3-2	vulnerable
	trixie	1.9.10-1+deb13u1	vulnerable
	forky	2.0.2-1	vulnerable
	sid	2.0.3-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency
dnsdist	source	bullseye	(unfixed)	end-of-life
dnsdist	source	bookworm	(unfixed)	end-of-life
dnsdist	source	(unstable)	2.0.3-1

Notes

[bookworm] - dnsdist <end-of-life> (See #1119290)
[bullseye] - dnsdist <end-of-life> (see #1119290)
https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-02.html
https://downloads.powerdns.com/patches/2026-02/