CVEvulnerability

CVE-2026-3591

5.4 MEDIUM Published 2026-03-25 Modified 2026-06-17 Official page ↗
Status
Analyzed
Published
2026-03-25
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
5.4 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Weaknesses
CWE-305, CWE-562

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.

Affected configurations

• isc bind (>= 9.20.0 < 9.20.21) • isc bind (>= 9.21.0 < 9.21.20)

Related

Weakness · CWE (2)

  • CWE-305 Authentication Bypass by Primary Weakness weakness
  • CWE-562 Return of Stack Variable Address weakness

References