CVE-2026-41292

Publication date 20 May 2026

Last updated 2 June 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

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).

Status

Package Ubuntu Release Status
unbound 26.04 LTS resolute
Fixed 1.24.2-1ubuntu2.1
25.10 questing
Fixed 1.22.0-2ubuntu2.3
24.04 LTS noble
Fixed 1.19.2-1ubuntu3.8
22.04 LTS jammy
Fixed 1.13.1-1ubuntu5.15
20.04 LTS focal
Vulnerable
18.04 LTS bionic
Vulnerable
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected

Severity score breakdown

Parameter Value
Base score 7.5 · High
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

Other references

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