Detections
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Echo: unbound: security update to 1.25.2

high Tenable Self-Hosted Container Security Plugin ID 464645

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, insufficient validation of the RRSIG.Labels field
 combined with premature cache writes during RFC 8198 aggressive NSEC processing leads to cache poisoning
 that permits a malicious actor controlling a single delegated zone to poison arbitrary sibling zones under
 NSEC-signed parent domains. A malicious actor with one registered domain under an NSEC-signed TLD can
 serve malicious insecure DNS responses for unrelated sibling domains (sharing the same parent zone).
 Arbitrary delegations that do not exist under the parent domain and are covered by the parent's NSEC chain
 can be brought into insecure existence by fraudulent wildcard DS records (less labels than expected,
 unknown algorithm) from the malicious sibling domain. This allows the malicious actor to inject insecure
 wildcard records for those delegations. (CVE-2026-44690)

Solution

Update the unbound library and its related packages to version 1.25.2 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-44690

Plugin Details

Severity: High

ID: 464645

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.63

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:C/A:N

CVSS Score Source: CVE-2026-44690

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 7/23/2026

Vulnerability Publication Date: 7/22/2026

Reference Information

CVE: CVE-2026-44690