CVE-2026-18726

Name	CVE-2026-18726
Description	A flaw was found in open-iscsi. This vulnerability allows a remote attacker on the same local network segment to cause a Denial of Service (DoS) in the iscsiuio daemon. By sending a specially crafted Internet Control Message Protocol version 6 (ICMPv6) Router Advertisement with a zero-length option, the attacker can trigger an infinite loop. This leads to sustained CPU usage, rendering the daemon unresponsive and impacting system availability. A secondary risk of out-of-bounds reads exists with a short IPv6 payload, though no memory corruption or data exposure has been confirmed.
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)
Debian Bugs	1144935

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
open-iscsi (PTS)	bookworm	2.1.8-1	vulnerable
	trixie	2.1.11-1+deb13u2	vulnerable
	forky, sid	2.1.12-2	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
open-iscsi	source	(unstable)	(unfixed)			1144935

Notes

[trixie] - open-iscsi <no-dsa> (Minor issue)
https://bugzilla.redhat.com/show_bug.cgi?id=2462331
https://github.com/open-iscsi/open-iscsi/issues/543
https://github.com/open-iscsi/open-iscsi/pull/544
Fixed by: https://github.com/open-iscsi/open-iscsi/commit/0bdc1ab6718215e67a4acff1e711fc8c6693cff4