A use-after-return vulnerability exists in the server when handling DNS queries signed with SIG(0).

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Mar 25, 2026 · NIST NVD

   Detected

   A use-after-return vulnerability exists in the 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 th

2. Jun 17, 2026 · NIST NVD

   Updated

   A use-after-return vulnerability exists in the 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 th

Affected

• cpe isc/bindversion unspecified

Sources

• CVE.orgVulnerability recordCVE-2026-3591

  Official CVE identifier

  cve.org
• NIST NVDVulnerability recordCVE-2026-3591

  A use-after-return vulnerability exists in the 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 addr

  nvd.nist.gov

References

• Patch · downloads.isc.org
• Patch · downloads.isc.org
• Vendor Advisory · kb.isc.org