CVE & CISA-KEV Catalog

CVE-2026-41292

MEDIUM
7.5
CVSS v3
NVD

Description

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).

CWE-407CWE-770Allocation of Resources Without Limits or ThrottlingCWE-1050

How to fix

Remediation Available
unboundDebian
Fixed in:1.22.0-2+deb13u3CVE-2026-41292
Fixed in:1.25.1-1CVE-2026-41292
libunbound2Ubuntu
Fixed in:1.4.22-1ubuntu4.14.04.3+esm3USN-8282-2
Fixed in:1.5.8-1ubuntu1.1+esm3USN-8282-2
Fixed in:1.6.7-1ubuntu2.6+esm4USN-8282-2
libunbound8Ubuntu
Fixed in:1.9.4-2ubuntu1.11+esm1USN-8282-2
Fixed in:1.13.1-1ubuntu5.15USN-8282-1
Fixed in:1.19.2-1ubuntu3.8USN-8282-1
Fixed in:1.22.0-2ubuntu2.3USN-8282-1
unboundUbuntu
Fixed in:1.4.22-1ubuntu4.14.04.3+esm3USN-8282-2
Fixed in:1.5.8-1ubuntu1.1+esm3USN-8282-2
Fixed in:1.6.7-1ubuntu2.6+esm4USN-8282-2
Fixed in:1.9.4-2ubuntu1.11+esm1USN-8282-2
Fixed in:1.13.1-1ubuntu5.15USN-8282-1
Fixed in:1.19.2-1ubuntu3.8USN-8282-1
Fixed in:1.22.0-2ubuntu2.3USN-8282-1

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityNone
IntegrityNone
AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

0.56%probability of exploitation in 30 days
43rdpercentile

Moderate risk: more likely to be exploited than 43% of all known CVEs.

References

Vendor Advisory1

Related Vulnerabilities

Other CWE-407 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2020-27223Medium5.278%-Fix
CVE-2022-36021Medium5.560%-Fix
CVE-2021-33582High7.53.1%-Fix
CVE-2024-43485High7.53.1%-Fix
CVE-2024-43484High7.52.9%-Fix
CVE-2016-10396High7.52.9%--
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-16.