High 7.5Published May 20, 2026

CVE-2026-3039BIND 9 server memory exhaustion during GSS-API TKEY negotiation

Updated under an hour ago (Oct 27, 2026, 6:10 AM ET)

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It affects ISC BIND 9 and 7 other products. Add what you run to find out whether that includes you.

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Every CVE for ISC BIND 9

Exploited in the last 30 days

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: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-771, CWE-770
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: isc
NVD analysis: Modified
Record last updated: Sep 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

ISC BIND 9 isc:bind_9 (from the name)	from 9.0.0 through 9.16.50; from 9.18.0 through 9.18.48; from 9.20.0 through 9.20.22; from 9.21.0 through 9.21.21; from 9.9.3-S1 through 9.16.50-S1; from 9.18.11-S1 through 9.18.48-S1; from 9.20.9-S1 through 9.20.22-S1	CNA record
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	from 32:9.18.33-15.el10_2.2 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support redhat:rhel_els	from 32:9.11.4-26.P2.el7_9.21 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions redhat:rhel_e4s	from 32:9.16.23-18.el9_4.12 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support redhat:rhel_eus	from 32:9.16.23-31.el9_6.4 not affected	CISA ADP
Red Hat Red Hat OpenShift Container Platform 4.16 redhat:openshift	from 416.94.202609011112-0 not affected	CISA ADP
Red Hat Red Hat Hardened Images redhat:hummingbird	from 9.18.49-1.hum1 not affected	CISA ADP
isc bind isc:bind	from 9.0.0 through 9.16.50; from 9.18.0 before 9.18.49; from 9.20.0 before 9.20.23; from 9.21.0 before 9.21.22	NVD

References

References

https://kb.isc.org/docs/cve-2026-3039	vendor-advisory
https://downloads.isc.org/isc/bind9/9.18.49	patch
https://downloads.isc.org/isc/bind9/9.20.23	patch
https://downloads.isc.org/isc/bind9/9.21.22	patch
https://access.redhat.com/errata/RHSA-2026:20334
https://access.redhat.com/errata/RHSA-2026:23360
https://access.redhat.com/errata/RHSA-2026:24338
https://access.redhat.com/errata/RHSA-2026:24339
https://access.redhat.com/errata/RHSA-2026:24367
https://access.redhat.com/errata/RHSA-2026:24368
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.