#VU124616 Resource exhaustion in ISC BIND - CVE-2026-1519
Published: March 25, 2026
Vulnerability identifier: #VU124616
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-1519
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
ISC BIND
ISC BIND
Software vendor:
ISC
ISC
Description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper input validation in the DNSSEC validation component when handling NSEC3 records during insecure delegation validation. A remote attacker can send a specially crafted DNS zone response to cause excessive CPU load on the resolver.
Resolvers performing DNSSEC validation are affected; authoritative-only servers are generally not affected unless they perform recursive queries.
Remediation
Install security update from vendor's website.