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Fencer Vulns
medium 6.5

CVE-2026-18726 json

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

published 2026-08-12 2 mo ago modified 2026-11-05 3 d ago also EUVD-2026-57636

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 24%
public exploits
0
none known

Summary

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.

Patch / fix

  • open-iscsi Debian 12 2.1.8-1+deb12u1
  • open-iscsi Debian 14 2.1.13-1

debian advisories DEBIAN-CVE-2026-18726

  • open-iscsi openSUSE Tumbleweed 2.1.13-114.1

opensuse advisories openSUSE-SU-2026:12102-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-18726 updated cvss 6.5

open-iscsi: open-iscsi: Denial of service in iscsiuio Router Advertisement parsing

  • Red Hat Enterprise Linux 9 iscsi-initiator-utils, python3-iscsi-initiator-utils, iscsi-initiator-utils-iscsiuio Red Hat Enterprise Linux 10 iscsi-initiator-utils
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.31% chance of exploitation in the next 30 days, higher than 24% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness
  • CWE-835 Loop with Unreachable Exit Condition

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.