BIND 9 server memory exhaustion during GSS-API TKEY negotiation
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 1.0%
exploitation probability
1.0%top 37% of all CVEs
observed exploitation
nono source reports it
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
ISC · BIND 9References
https://access.redhat.com/errata/RHSA-2026:20334https://access.redhat.com/errata/RHSA-2026:23360https://access.redhat.com/errata/RHSA-2026:24338https://access.redhat.com/errata/RHSA-2026:24339https://access.redhat.com/errata/RHSA-2026:24367https://access.redhat.com/errata/RHSA-2026:24368https://access.redhat.com/errata/RHSA-2026:55441https://access.redhat.com/errata/RHSA-2026:57189https://access.redhat.com/errata/RHSA-2026:60383https://access.redhat.com/errata/RHSA-2026:62549https://access.redhat.com/errata/RHSA-2026:65851https://access.redhat.com/security/cve/CVE-2026-3039