Detections
Analytics

Echo: bind9: security update to 1:9.20.26-1~deb13u1

high Tenable Self-Hosted Container Security Plugin ID 463224

Description

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

 - It is possible for an attacker's zone to respond to a query with an RRSIG that has a smaller number of
 labels than the zone in which the RRSIG is contained. This causes `named` to produce a wildcard name for a
 zone that is shorter than the attacker's zone, which can result in cache poisoning. For this attack to
 have any effect, the resolver under attack must have set `synth-from-dnssec yes;` (which is the default).
 This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23,
 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1. (CVE-2026-11721)

Solution

Update the bind9 library and its related packages to version 1:9.20.26-1~deb13u1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-11721

Plugin Details

Severity: High

ID: 463224

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.62

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-2026-11721

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-2026-11721

IAVA: 2026-A-0764-S