CVE-2026-114605

Name	CVE-2026-114605
Description	dnspython is a DNS toolkit for Python. Prior to 2.9.0, dns.name.from_wire_parser follows attacker-controlled DNS compression pointer chains without a hop limit. A malicious DNS wire-format message can force excessive pointer traversal during name decompression, causing high CPU use, application degradation, or denial of service in applications that process untrusted DNS messages. This issue is fixed in version 2.9.0.
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)
References	DLA-4892-1
Debian Bugs	1151842

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
dnspython (PTS)	bookworm	2.3.0-1	vulnerable
	bookworm (security)	2.3.0-1+deb12u1	fixed
	trixie	2.7.0-1	vulnerable
	forky, sid	2.8.0-7	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
dnspython	source	bookworm	2.3.0-1+deb12u1		DLA-4892-1
dnspython	source	(unstable)	2.8.0-7			1151842

Notes

[trixie] - dnspython <no-dsa> (Minor issue)
https://github.com/rthalley/dnspython/security/advisories/GHSA-45c3-73f7-pv4m
Fixed by: https://github.com/rthalley/dnspython/commit/b485e460c266540a1a09ca6d8d1d7b685b1d3023 (v2.9.0)