Description

A use-after-return vulnerability exists in the `named` server when handling DNS queries signed with SIG(0). Using a specially-crafted DNS request, an attacker may be able to cause an ACL to improperly (mis)match an IP address. In a default-allow ACL (denying only specific IP addresses), this may lead to unauthorized access. Default-deny ACLs should fail-secure. This issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1. BIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.

INFO

Published Date :

2026-03-25T13:34:14.202Z

Last Modified :

2026-03-25T14:13:01.659Z

Source :

isc
AFFECTED PRODUCTS

The following products are affected by CVE-2026-3591 vulnerability.

Vendors Products
Isc
  • Bind
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-3591.

URL Resource
https://downloads.isc.org/isc/bind9/9.20.21 cve-icon cve-icon cve-icon
https://downloads.isc.org/isc/bind9/9.21.20 cve-icon cve-icon cve-icon
https://kb.isc.org/docs/cve-2026-3591 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-3591 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-3591 cve-icon
Login to claim this CVE

CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact