ISC BIND 9.20.0 < 9.20.21 / 9.20.9-S1 < 9.20.21-S1 / 9.21.0 < 9.21.20 Assertion Failure (cve-2026-3104)

high Nessus Plugin ID 303597

Synopsis

The remote name server is affected by an assertion failure vulnerability vulnerability.

Description

The version of ISC BIND installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the cve-2026-3104 advisory.

- A specially crafted domain can be used to cause a memory leak in a BIND resolver simply by querying this domain.If a BIND resolver is asked to query a specially crafted domain, memory will not be recovered by named . This can cause unbounded growth of Resident Set Size (RSS) memory, which may lead to an out-of- memory condition. Additionally, named will exit with an assertion failure if a shutdown or reload is attempted. - Authoritative services are believed to be unaffected by this vulnerability but it is important to read: https://kb.isc.org/docs/why-does-my-authoritative-server-make-recursive-queries
- Resolvers are affected by this vulnerability. Authoritative services are believed to be unaffected by this vulnerability but it is important to read: https://kb.isc.org/docs/why-does-my-authoritative-server- make-recursive-queries Resolvers are affected by this vulnerability. (CVE-2026-3104)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to ISC BIND version 9.20.21 / 9.20.21-S1 / 9.21.20 or later.

Plugin Details

Severity: High

ID: 303597

File Name: bind9_92120_cve-2026-3104.nasl

Version: 1.1

Type: remote

Family: DNS

Published: 3/25/2026

Updated: 3/25/2026

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

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-2026-3104

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

Vulnerability Information

CPE: cpe:/a:isc:bind

Required KB Items: bind/version, Settings/ParanoidReport

Exploit Ease: No known exploits are available

Patch Publication Date: 3/25/2026

Vulnerability Publication Date: 3/25/2026

Reference Information

CVE: CVE-2026-3104

Detections

Analytics