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Vulnerability · Published Aug 12, 2026 · Assigned by redhat

CVE-2026-18726Open-iscsi: open-iscsi: denial of service in iscsiuio router advertisement parsing

Medium 6.5

In plain English

A medium-severity infinite loop in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.3%top 75.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12open-iscsi2.1.8-1+deb12u1DEBIAN-CVE-2026-18726
Debian:13open-iscsino fix listedDEBIAN-CVE-2026-18726
Debian:14open-iscsi2.1.13-1DEBIAN-CVE-2026-18726
Ubuntu:22.04:LTSopen-iscsino fix listedUBUNTU-CVE-2026-18726
Ubuntu:24.04:LTSopen-iscsino fix listedUBUNTU-CVE-2026-18726
Ubuntu:26.04:LTSopen-iscsino fix listedUBUNTU-CVE-2026-18726
Ubuntu:26.10open-iscsino fix listedUBUNTU-CVE-2026-18726

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 9 see references

Weakness: CWE-835 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References