Detections
Analytics

Echo: unbound: security update to 1.26.1

critical Tenable Cloud Security Plugin ID 459419

Description

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

 - In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in the DNSSEC validator that
 enables denial of service and possible remote code execution as a result of digesting DNSKEYs. A DNSKEY
 with an owner compression pointer to its own RDATA can overflow the digest buffer. Remote code execution
 is possible through attacker controlled data. An adversary can exploit the vulnerability by controlling a
 malicious zone and querying a vulnerable Unbound. (CVE-2026-81642)

Solution

Update the unbound library and its related packages to version 1.26.1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-81642

Plugin Details

Severity: Critical

ID: 459419

Version: Revision 1.2

Type: Local

Published: 10/2/2026

Updated: 10/5/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: High

Score: 7.7

Percentile: 98.93

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-81642

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

CVSS v4

Risk Factor: Critical

Base Score: 10

Threat Score: 9.1

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 9/16/2026

Vulnerability Publication Date: 9/16/2026

Reference Information

CVE: CVE-2026-81642

IAVA: 2026-A-1070