Ubuntu update for unbound

1) Insufficient verification of data authenticity

EUVDB-ID: #VU117534

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-11411

CWE-ID: CWE-345 - Insufficient Verification of Data Authenticity

Exploit availability: No

Description

The vulnerability allows a remote attacker to poison DNS cache. 

The vulnerability exists due to incorrect processing of DNS responses contain NS RRSets records. A remote attacker can poison DNS cache of the affected server.

Mitigation

Update the affected package unbound to the latest version.

Vulnerable software versions

Ubuntu: 22.04 - 25.10

unbound (Ubuntu package): before 1.13.1-1ubuntu5.13

CPE2.3

• cpe:2.3:o:canonical:ubuntu:22.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:24.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:25.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:25.10:*:*:*:*:*:*:*
• cpe:2.3:a:canonical:unbound_ubuntu_package:*:*:*:*:*:ubuntu:*:*

External links

https://ubuntu.com/security/notices/USN-7855-1

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.