CVE-2026-3039

HIGH

BIND 9 server memory exhaustion during GSS-API TKEY negotiation

Title source: cna
STIX 2.1

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.

References (13)

Core 13
Core References
Vendor Advisory vendor-advisory
CVE-2026-3039
https://kb.isc.org/docs/cve-2026-3039

Scores

CVSS v3 7.5
EPSS 0.0105
EPSS Percentile 60.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-770 CWE-771
Status published
Products (8)
isc/bind 9.0.0 - 9.16.50
ISC/BIND 9 9.0.0 - 9.16.50
ISC/BIND 9 9.18.0 - 9.18.48
ISC/BIND 9 9.18.11-S1 - 9.18.48-S1
ISC/BIND 9 9.20.0 - 9.20.22
ISC/BIND 9 9.20.9-S1 - 9.20.22-S1
ISC/BIND 9 9.21.0 - 9.21.21
ISC/BIND 9 9.9.3-S1 - 9.16.50-S1
Published May 20, 2026
Tracked Since May 20, 2026