CVE-2026-3039
published 2026-05-20CVE-2026-3039: BIND servers that are configured to use TKEY-based authentication via GSS-API tokens are vulnerable to excessive memory consumption when receiving and…
PriorityP347high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
1.05%
59.9th percentile
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.
Affected
14 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| isc | bind | — | — |
| isc | bind | 9.0.0 – 9.16.50 | — |
| isc | bind | >= 9.18.0 < 9.18.49 | 9.18.49 |
| isc | bind | >= 9.20.0 < 9.20.23 | 9.20.23 |
| isc | bind | >= 9.21.0 < 9.21.22 | 9.21.22 |
| 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 | — |
| isc | dhcp | — | — |
| ubuntu | bind9 | — | — |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vendor_redhat7.5HIGH
vendor_ubuntu7.5HIGH
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Ubuntu
Bind vulnerabilities
vendor_ubuntu·2026-05-21·CVSS 7.5
CVE-2026-5950 [HIGH] Bind vulnerabilities
Title: Bind vulnerabilities
Summary: Several security issues were fixed in Bind.
Vitaly Simonovich discovered that Bind could exhaust memory during GSS-API
TKEY negotiation. A remote attacker could possibly use this issue to cause
Bind to use excessive resources, leading to a denial of service.
(CVE-2026-3039)
Shuhan Zhang discovered that Bind incorrectly handled self-pointed glue
records. A remote attacker could possibly use this issue to use Bind in
denial of service amplification attacks against other systems.
(CVE-2026-3592)
Naresh Kandula Parmar discovered that Bind incorrectly handled memory in
the DNS-over-HTTPS implementation. A remote attacker could possibly use
this issue to cause Bind to crash, resulting in a denial of service, or
execute arbitrary code. This issue only affe
Red Hat
bind: BIND 9 server memory exhaustion during GSS-API TKEY negotiation
vendor_redhat·2026-05-21·CVSS 7.5
CVE-2026-3039 [HIGH] CWE-770 bind: BIND 9 server memory exhaustion during GSS-API TKEY negotiation
bind: BIND 9 server memory exhaustion during GSS-API TKEY negotiation
A flaw was found in BIND. A remote attacker can exploit this vulnerability by sending maliciously-constructed packets to BIND servers configured for TKEY-based authentication via GSS-API (Generic Security Service Application Program Interface) tokens. This can lead to excessive memory consumption, resulting in a Denial of Service (DoS) for the affected server.
Statement: Important: BIND servers configured for TKEY-based GSS-API authentication are vulnerable to memory exhaustion when processing maliciously-constructed packets. This can lead to a denial of service, specifically impacting Red Hat deployments integrated with Active Directory or Kerberos for DNS where this authentication method is enabled.
Mitigation: Miti
GHSA
GHSA-p65f-mhrm-vhrc: BIND servers that are configured to use TKEY-based authentication via GSS-API tokens are vulnerable to excessive memory consumption when receiving and
ghsa_unreviewed·2026-05-20
CVE-2026-3039 [HIGH] CWE-771 GHSA-p65f-mhrm-vhrc: BIND servers that are configured to use TKEY-based authentication via GSS-API tokens are vulnerable to excessive memory consumption when receiving and
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.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-3039 dhcp: BIND 9 server memory exhaustion during GSS-API TKEY negotiation [fedora-all]
bugzilla·2026-05-26·CVSS 7.5
CVE-2026-3039 [HIGH] CVE-2026-3039 dhcp: BIND 9 server memory exhaustion during GSS-API TKEY negotiation [fedora-all]
CVE-2026-3039 dhcp: BIND 9 server memory exhaustion during GSS-API TKEY negotiation [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Bugzilla
CVE-2026-3039 bind: BIND 9 server memory exhaustion during GSS-API TKEY negotiation [fedora-all]
bugzilla·2026-05-26·CVSS 7.5
CVE-2026-3039 [HIGH] CVE-2026-3039 bind: BIND 9 server memory exhaustion during GSS-API TKEY negotiation [fedora-all]
CVE-2026-3039 bind: BIND 9 server memory exhaustion during GSS-API TKEY negotiation [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Bugzilla
CVE-2026-3039 bind: BIND 9 server memory exhaustion during GSS-API TKEY negotiation
bugzilla·2026-05-19·CVSS 7.5
CVE-2026-3039 [HIGH] CVE-2026-3039 bind: BIND 9 server memory exhaustion during GSS-API TKEY negotiation
CVE-2026-3039 bind: BIND 9 server memory exhaustion during GSS-API TKEY negotiation
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.
https://downloads.isc.org/isc/bind9/9.18.49https://downloads.isc.org/isc/bind9/9.20.23https://downloads.isc.org/isc/bind9/9.21.22https://kb.isc.org/docs/cve-2026-3039https://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/security/cve/CVE-2026-3039https://bugzilla.redhat.com/show_bug.cgi?id=2479767https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3039.json
2026-05-20
Published