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Important
2026-05-21T12:24:11
bind: BIND 9 server memory exhaustion during GSS-API TKEY negotiation
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-770
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.
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 for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Example:
```bash
# Edit /etc/named.conf and remove or comment out lines related to tkey-gssapi-keytab or tkey-gssapi-credential.
# For example, remove or comment out:
# key "gssapi-key" {
# algorithm GSSAPI;
# secret "BASE64_ENCODED_KEY";
# };
#
# Then reload the named service:
systemctl reload named
```
Reloading the `named` service may cause a brief interruption in DNS resolution.
Red Hat Hardened Images
2026-05-21T00:00:00Z
RHSA-2026:20334
bind-main-9.18.49-1.hum1
Red Hat Enterprise Linux 10
Affected
bind
Red Hat Enterprise Linux 6
Affected
bind
Red Hat Enterprise Linux 7
Affected
bind
Red Hat Enterprise Linux 8
Affected
bind
Red Hat Enterprise Linux 8
Affected
bind9.16
Red Hat Enterprise Linux 9
Affected
bind
Red Hat Enterprise Linux 9
Affected
bind9.18
Red Hat Enterprise Linux 9
Not affected
dhcp
Red Hat OpenShift Container Platform 4
Affected
rhcos
https://www.cve.org/CVERecord?id=CVE-2026-3039
https://nvd.nist.gov/vuln/detail/CVE-2026-3039