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CVE-2026-3039 is a remotely exploitable denial-of-service vulnerability in ISC BIND 9 affecting servers configured to use TKEY-based authentication via GSS-API tokens. When the server receives maliciously constructed packets during GSS-API TKEY negotiation, it performs excessive memory allocation and the allocated memory is not properly released, leading to unbounded memory consumption. The issue is primarily relevant to deployments using Kerberos-secured DNS or Active Directory-integrated DNS. Reported affected versions are BIND 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, and Supported Preview Edition versions 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.
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No public exploit code observed for this vulnerability.
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21 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A memory exhaustion vulnerability in ISC BIND 9 during GSS-API TKEY negotiation that attackers could exploit to degrade server performance.
A high-severity memory leak in BIND 9 affecting TKEY-based authentication via GSS-API tokens, allowing unauthenticated remote attackers to cause memory exhaustion and daemon crashes.
A BIND 9 vulnerability that can cause server memory exhaustion during GSS-API TKEY negotiation.
A high-severity remote memory exhaustion vulnerability in BIND 9 during GSS-API TKEY negotiation that can cause named to fail due to unreleased memory allocation and eventual denial of service.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.