#VU124613 Operation on a Resource after Expiration or Release in ISC BIND - CVE-2026-3591
Published: March 25, 2026
Vulnerability identifier: #VU124613
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-3591
CWE-ID: CWE-672
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 user to bypass access controls.
The vulnerability exists due to a use-after-return error in the SIG(0) handling code in named when processing specially crafted DNS queries. A remote user can send a specially crafted DNS request to cause an ACL to improperly (mis)match an IP address, potentially leading to unauthorized access in default-allow ACL configurations.
Authoritative servers and resolvers are affected. In a default-allow ACL (which denies only specific IP addresses), this may lead to unauthorized access. Default-deny ACLs should fail securely.
Remediation
Install security update from vendor's website.