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CVE PROGRAM SOURCE RECORD5.4 Medium

CVE-2026-3591

A stack use-after-return flaw in SIG(0) handling code may enable ACL bypass

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Status
Published
Published
Updated
Assigning organization
isc

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 products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

ISC BIND 9

Default version status: unaffected

  • 9.20.0 to ≤ 9.20.20affected
  • 9.21.0 to ≤ 9.21.19affected
  • 9.20.9-S1 to ≤ 9.20.20-S1affected
  • 9.18.0 to ≤ 9.18.46unaffected
  • 9.18.11-S1 to ≤ 9.18.46-S1unaffected

References