ISC BIND up to 9.21.19 Zone unchecked input for loop condition

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in ISC BIND up to 9.21.19. This affects an unknown function of the component Zone Handler. The manipulation results in unchecked input for loop condition. This vulnerability is known as CVE-2026-1519. It is possible to launch the attack remotely. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in ISC BIND up to 9.21.19. It has been classified as problematic. Affected is an unknown functionality of the component Zone Handler. The manipulation with an unknown input leads to a unchecked input for loop condition vulnerability. CWE is classifying the issue as CWE-606. The product does not properly check inputs that are used for loop conditions, potentially leading to a denial of service or other consequences because of excessive looping. This is going to have an impact on availability. CVE summarizes:

If a BIND resolver is performing DNSSEC validation and encounters a maliciously crafted zone, the resolver may consume excessive CPU. Authoritative-only servers are generally unaffected, although there are circumstances where authoritative servers may make recursive queries (see: https://kb.isc.org/docs/why-does-my-authoritative-server-make-recursive-queries). This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.46, 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.46-S1, and 9.20.9-S1 through 9.20.20-S1.

The advisory is available at kb.isc.org. This vulnerability is traded as CVE-2026-1519 since 01/28/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1449 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 303734 (Linux Distros Unpatched Vulnerability : CVE-2026-1519), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 9.18.47, 9.20.21 or 9.21.20 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (303734) and CERT Bund (WID-SEC-2026-1666). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • IBM QRadar SIEM

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (isc): 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Unchecked input for loop condition
CWE: CWE-606 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 303734
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-1519

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: BIND 9.18.47/9.20.21/9.21.20

Timelineinfo

01/28/2026 CVE reserved
03/25/2026 +56 days Advisory disclosed
03/25/2026 +0 days VulDB entry created
05/26/2026 +62 days VulDB entry last update

Sourcesinfo

Vendor: isc.org

Advisory: kb.isc.org
Status: Confirmed

CVE: CVE-2026-1519 (🔒)
GCVE (CVE): GCVE-0-2026-1519
GCVE (VulDB): GCVE-100-353130
CERT Bund: WID-SEC-2026-1666 - IBM QRadar SIEM: Mehrere Schwachstellen

Entryinfo

Created: 03/25/2026 15:19
Updated: 05/26/2026 13:24
Changes: 03/25/2026 15:19 (64), 03/26/2026 07:25 (2), 03/30/2026 23:44 (1), 05/26/2026 13:24 (7)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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