Vulnerability DatabaseCVE-2026-1519
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CVE-2026-1519
March 25, 2026
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.
Affected Packages
https://gitlab.isc.org/isc-projects/bind9.git (SCM_GIT):
Affected version(s) >=v9.20.0 <v9.20.21
Fix Suggestion:
Update to version v9.20.21
https://gitlab.isc.org/isc-projects/bind9.git (SCM_GIT):
Affected version(s) >=v9.20.0 <v9.20.21
Fix Suggestion:
Update to version v9.20.21
https://gitlab.isc.org/isc-projects/bind9.git (SCM_GIT):
Affected version(s) >=v9.20.0 <v9.20.21
Fix Suggestion:
Update to version v9.20.21
https://gitlab.isc.org/isc-projects/bind9.git (SCM_GIT):
Affected version(s) >=v9.18.0 <v9.18.47
Fix Suggestion:
Update to version v9.18.47
https://gitlab.isc.org/isc-projects/bind9.git (SCM_GIT):
Affected version(s) >=v9.21.0 <v9.21.19
Fix Suggestion:
Update to version v9.21.19
https://gitlab.isc.org/isc-projects/bind9.git (SCM_GIT):
Affected version(s) >=v9.18.0 <v9.18.47
Fix Suggestion:
Update to version v9.18.47
https://gitlab.isc.org/isc-projects/bind9.git (SCM_GIT):
Affected version(s) >=v9.18.0 <v9.18.47
Fix Suggestion:
Update to version v9.18.47
https://gitlab.isc.org/isc-projects/bind9.git (SCM_GIT):
Affected version(s) >=v9.21.0 <v9.21.19
Fix Suggestion:
Update to version v9.21.19
https://gitlab.isc.org/isc-projects/bind9.git (SCM_GIT):
Affected version(s) >=v9.21.0 <v9.21.19
Fix Suggestion:
Update to version v9.21.19
Related Resources (4)
https://downloads.isc.org/isc/bind9/9.21.20
https://kb.isc.org/docs/cve-2026-1519
https://downloads.isc.org/isc/bind9/9.20.21
https://downloads.isc.org/isc/bind9/9.18.47
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CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Unchecked Input for Loop Condition
CWE-606
EPSS
Base Score:
0.04