Vulnerability intelligence

CVE-2026-3039

BIND servers that are configured to use TKEY-based authentication via GSS-API tokens are vulnerable to excessive memory consumption when receiving and processing maliciously-constructed packets. Typically these servers will be found in Active Directory integrated DNS deployments and/or Kerberos-secured DNS environments. This issue affects BIND 9 versions 9.0.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.9.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.

CVSS Score

7.5

High

EPSS — Exploit Probability

1.0%

Riskier than 60% of all CVEs

Exploitation

Not in CISA KEV

No federal exploitation record

Remediation

Patch available

Vendor fix published

NVD entry Vendor patch PoC / advisory

1 article across 1 outlet · first covered May 26, 2026 · latest May 26, 2026

Coverage timeline

BIND 9 flaws let attackers crash DNS and drain bandwidth
securityonline.info · May 26, 2026