CVE-2026-3039
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductIsc Bind
PublishedMay 20, 2026
First seenMay 20, 2026
Weakness typeCWE-771CWE-771
How to fix
Update
- isc bind9.18.49, 9.20.23, 9.21.22 or later
Patches
Vendor advisories
- kb.isc.org/docs/cve-2026-3039
- access.redhat.com/errata/RHSA-2026:60383
- access.redhat.com/errata/RHSA-2026:62549
- access.redhat.com/errata/RHSA-2026:65851
- access.redhat.com/errata/RHSA-2026:24338
- access.redhat.com/errata/RHSA-2026:24339
- access.redhat.com/errata/RHSA-2026:23360
- access.redhat.com/errata/RHSA-2026:57189
- access.redhat.com/errata/RHSA-2026:55441
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| isc bind | 9.0.0 ≤ v ≤ 9.16.50, 9.18.0 ≤ v < 9.18.49, 9.20.0 ≤ v < 9.20.23, 9.21.0 ≤ v < 9.21.22 | 9.18.49, 9.20.23, 9.21.22 |
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