CVE-2026-1519 Details
Description
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.
A vulnerability in ISC BIND 9 resolvers performing DNSSEC validation can lead to high CPU consumption when processing maliciously crafted zones. This issue affects BIND 9 versions 9.11.0 prior to 9.16.50, 9.18.0 prior to 9.18.46, 9.20.0 prior to 9.20.20, and 9.21.0 prior to 9.21.19, as well as BIND Supported Preview Edition versions 9.11.3-S1 prior to 9.16.50-S1, 9.18.11-S1 prior to 9.18.46-S1, and 9.20.9-S1 prior to 9.20.20-S1. While authoritative-only servers are generally not affected, they may occasionally make recursive queries under certain circumstances.
Users can upgrade to BIND versions 9.18.47, 9.20.21, or 9.21.20. For BIND Supported Preview Edition, upgrade to versions 9.18.47-S1, 9.20.21-S1.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 25, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-606 | Unchecked Input for Loop Condition | [email protected] |
| CWE-770 | Allocation of Resources Without Limits or Throttling | redhat-SADP |
Affected Products
| Product | Versions |
|---|---|
| isc bind | >= 9.11.0, <= 9.16.50 >= 9.18.0, < 9.18.47 >= 9.20.0, < 9.20.21 >= 9.21.0, < 9.21.20 |
CPE
Remediation
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Change History
17 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 17, 2026 | CVE Modified | redhat-SADP |
| Sep 10, 2026 | CVE Modified | redhat-SADP |
| Sep 4, 2026 | CVE Modified | redhat-SADP |
| Sep 4, 2026 | CVE Modified | CVE |
| Sep 4, 2026 | CVE Modified | [email protected] |
| Aug 3, 2026 | CVE Modified | redhat-SADP |
| Jul 23, 2026 | CVE Modified | redhat-SADP |
| Jul 20, 2026 | CVE Modified | redhat-SADP |
| Jul 15, 2026 | CVE Modified | redhat-SADP |
| Jul 10, 2026 | CVE Modified | redhat-SADP |
| Jul 3, 2026 | CVE Modified | redhat-SADP |
| Jun 30, 2026 | CVE Modified | redhat-SADP |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 21, 2026 | Initial Analysis | [email protected] |
| Apr 13, 2026 | CVE Modified | CVE |
| Mar 25, 2026 | New CVE Received | [email protected] |