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Fencer Vulns
high 7.5

CVE-2026-41292 json

Long list of incoming EDNS options degrades performance

published 2026-05-20 5 mo ago modified 2026-09-01 2 mo ago also EUVD-2026-31078

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 55%
public exploits
0
none known

Summary

NLnet Labs Unbound up to and including version 1.25.0 is vulnerable to a degradation of service attack related to parsing long lists of incoming EDNS options. An adversary sending queries with too many EDNS options can hold Unbound threads hostage while they are parsing and creating internal data structures for the options. Coordinated attacks can result in degradation and/or denial of service. Unbound 1.25.1 contains a patch with a fix to limit acceptable incoming EDNS options (100).

Patch / fix

  • NLnet Labs Unbound 1.25.1
  • Red Hat Red Hat Enterprise Linux 10 0:1.24.2-7.el10_2.2
  • Red Hat Red Hat Enterprise Linux 8 0:1.16.2-5.12.el8_10
  • Red Hat Red Hat Enterprise Linux 9 0:1.24.2-3.el9_8.2
  • Red Hat Red Hat OpenShift Container Platform 4.22 4.22.9.8.202608130832-0
  • Red Hat Red Hat Hardened Images 1.25.1-2.hum1
  • unbound Debian 13 1.22.0-2+deb13u3
  • unbound Debian 14 1.25.1-1

debian advisories DEBIAN-CVE-2026-41292

  • unbound Ubuntu 22.04 LTS 1.13.1-1ubuntu5.15
  • unbound Ubuntu 24.04 LTS 1.19.2-1ubuntu3.8
  • unbound Ubuntu 25.10 1.22.0-2ubuntu2.3
  • unbound Ubuntu 26.04 LTS 1.24.2-1ubuntu2.1
  • unbound Ubuntu Pro 18.04 LTS 1.6.7-1ubuntu2.6+esm4
  • unbound Ubuntu Pro 20.04 LTS 1.9.4-2ubuntu1.11+esm1

ubuntu advisories UBUNTU-CVE-2026-41292

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • unbound RHEL 8 1.16.2-5.12.el8_10
  • unbound-libs RHEL 8 1.16.2-5.12.el8_10
  • python3-unbound RHEL 8 1.16.2-5.12.el8_10
  • unbound RHEL 9 1.24.2-3.el9_8.2
  • unbound-libs RHEL 9 1.24.2-3.el9_8.2
  • unbound-dracut RHEL 9 1.24.2-3.el9_8.2
  • python3-unbound RHEL 9 1.24.2-3.el9_8.2
  • unbound RHEL 10.2 1.24.2-7.el10_2.2

red hat advisories RHSA-2026:37282RHSA-2026:36777RHSA-2026:36320RHSA-2026:24013

  • unbound SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 1.24.1-160000.2.1
  • unbound SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +6 more 1.20.0-150100.10.25.1

suse advisories SUSE-SU-2026:22160-1SUSE-SU-2026:22213-1SUSE-SU-2026:2369-1

  • unbound openSUSE Leap 16.0 1.24.1-160000.2.1
  • unbound openSUSE Tumbleweed 1.25.1-1.1

opensuse advisories openSUSE-SU-2026:21083-1openSUSE-SU-2026:10903-1

  • unbound AlmaLinux 8 1.16.2-5.12.el8_10
  • unbound-libs AlmaLinux 8 1.16.2-5.12.el8_10
  • python3-unbound AlmaLinux 8 1.16.2-5.12.el8_10
  • unbound AlmaLinux 9 1.24.2-3.el9_8.2
  • unbound-libs AlmaLinux 9 1.24.2-3.el9_8.2
  • unbound-dracut AlmaLinux 9 1.24.2-3.el9_8.2
  • python3-unbound AlmaLinux 9 1.24.2-3.el9_8.2
  • unbound AlmaLinux 10 1.24.2-7.el10_2.2

almalinux advisories ALSA-2026:37282ALSA-2026:36777ALSA-2026:36320

  • unbound Rocky Linux 10 1.24.2-7.el10_2.2
  • unbound Rocky Linux 9 1.24.2-3.el9_8.2
  • unbound Rocky Linux 8 1.16.2-5.12.el8_10

rocky linux advisories RLSA-2026:36320RLSA-2026:36777RLSA-2026:37282

  • unbound Alpine 3.23, Alpine 3.22 1.25.2-r0
  • unbound Alpine 3.24 1.25.1-r0

alpine advisories ALPINE-CVE-2026-41292

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • unbound Azure Linux 3.0 1.25.1-1

azure linux advisories AZL-87030

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2026-41292 updated cvss 7.5

unbound: Unbound: Denial of Service via excessive EDNS options

  • Red Hat Enterprise Linux 6 unbound, unbound-libs, unbound-python Red Hat Enterprise Linux 7 unbound, unbound-libs, unbound-python Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9 Red Hat OpenStack Platform 16.2 rhosp-rhel8-tech-preview/openstack-unbound Red Hat OpenStack Platform 17.1 rhosp-rhel9/openstack-unbound
    +1 more products
    Red Hat OpenStack Platform 18.0 rhoso/openstack-unbound-rhel9
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AppStream (v. 8) unbound 1.16.2-5.12.el8_10, unbound-libs 1.16.2-5.12.el8_10, python3-unbound 1.16.2-5.12.el8_10
    fixed: vendor fix RHSA-2026:37282
  • Red Hat Enterprise Linux AppStream (v. 9) unbound 1.24.2-3.el9_8.2, unbound-libs 1.24.2-3.el9_8.2, unbound-dracut 1.24.2-3.el9_8.2, python3-unbound 1.24.2-3.el9_8.2
    fixed: vendor fix RHSA-2026:36777
  • Red Hat Enterprise Linux AppStream (v. 10) unbound 1.24.2-7.el10_2.2, unbound-libs 1.24.2-7.el10_2.2, unbound-utils 1.24.2-7.el10_2.2, unbound-anchor 1.24.2-7.el10_2.2, unbound-dracut 1.24.2-7.el10_2.2, python3-unbound 1.24.2-7.el10_2.2
    fixed: vendor fix RHSA-2026:36320
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) unbound-devel 1.24.2-3.el9_8.2, unbound-debuginfo 1.24.2-3.el9_8.2, unbound-debugsource 1.24.2-3.el9_8.2, unbound-libs-debuginfo 1.24.2-3.el9_8.2, python3-unbound-debuginfo 1.24.2-3.el9_8.2
    fixed: vendor fix RHSA-2026:36777
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) unbound-devel 1.24.2-7.el10_2.2, unbound-debuginfo 1.24.2-7.el10_2.2, unbound-debugsource 1.24.2-7.el10_2.2, unbound-libs-debuginfo 1.24.2-7.el10_2.2, unbound-utils-debuginfo 1.24.2-7.el10_2.2, unbound-anchor-debuginfo 1.24.2-7.el10_2.2, +1 more
    fixed: vendor fix RHSA-2026:36320
  • Red Hat Hardened Images unbound 1.25.1-2.hum1, unbound-libs 1.25.1-2.hum1, unbound-munin 1.25.1-2.hum1, unbound-utils 1.25.1-2.hum1, unbound-anchor 1.25.1-2.hum1, unbound-dracut 1.25.1-2.hum1, +1 more
    fixed: vendor fix RHSA-2026:24013
  • Red Hat OpenShift Container Platform 4.22 rhcos 4.22.9.8.202608130832
    fixed: vendor fix RHSA-2026:54769
show 2 more
  • Red Hat Data Grid 8 unboundid-ldapsdk Red Hat JBoss Enterprise Application Platform Expansion Pack unboundid-ldapsdk
    not affected: component not present
  • Red Hat OpenStack Platform 18.0 rhoso-operators/designate-rhel9-operator
    not affected: vulnerable code not present

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
yes
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.75% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 6.6 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Red
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 4.0 6.6 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Red
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • NLnet Labs Unbound
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat OpenShift Container Platform 4.22
  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat Data Grid 8
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack
  • Red Hat Red Hat OpenStack Platform 16.2
  • Red Hat Red Hat OpenStack Platform 17.1
  • Red Hat Red Hat OpenStack Platform 18.0

Classification

Weakness
  • CWE-407 Inefficient Algorithmic Complexity
  • CWE-770 Allocation of Resources Without Limits or Throttling
  • CWE-1050 Excessive Platform Resource Consumption within a Loop

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.