CVE-2026-41292
Publication date 20 May 2026
Last updated 22 May 2026
Ubuntu priority
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 |
Needs evaluation
|
|
| 18.04 LTS bionic |
Needs evaluation
|
|
| 16.04 LTS xenial |
Needs evaluation
|
|
| 14.04 LTS trusty |
Needs evaluation
|
References
Related Ubuntu Security Notices (USN)
- USN-8282-1
- Unbound vulnerabilities
- 20 May 2026