Detections
Analytics

Echo: unbound: security update to 1.25.1-1

high Tenable Self-Hosted Container Security Plugin ID 457283

Description

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

 - NLnet Labs Unbound 1.14.0 up to and including version 1.25.0 has a vulnerability that results in heap
 overflow when encoding multiple NSID and/or DNS Cookie EDNS and/or EDNS Padding options in the reply
 packet. The relevant options ('nsid', 'answer-cookie', 'pad-responses' (default)) need to be enabled for
 the vulnerability to be exploited. An adversary who can query Unbound can exploit the vulnerability by
 attaching multiple NSID and/or DNS Cookie EDNS and/or EDNS Padding options to the query. A flaw in the
 size calculation of the EDNS field truncates the correct value which allows the encoder to overflow the
 available space when writing. Those two combined lead to a heap overflow write of Unbound controlled data
 and eventually a crash. Unbound 1.25.1 contains a patch with a fix to de-duplicate the EDNS options and a
 fix to prevent truncation of the EDNS field size calculation. (CVE-2026-42944)

Solution

Update the unbound library and its related packages to version 1.25.1-1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-42944

Plugin Details

Severity: High

ID: 457283

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.75

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-42944

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:N/A:H

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

CVSS v4

Risk Factor: High

Base Score: 8.7

Threat Score: 6.6

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 5/21/2026

Vulnerability Publication Date: 5/20/2026

Reference Information

CVE: CVE-2026-42944