Vulnerability · Published May 20, 2026 · Assigned by isc
CVE-2026-3039BIND 9 server memory exhaustion during GSS-API TKEY negotiation
High 7.5
In plain English
A high-severity resource allocation without limits in BIND 9 from ISC. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 65% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)1.1%top 34.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | bind | 32:9.18.33-15.el10_2.2 | ALSA-2026:24338 |
| AlmaLinux:8 | bind | 32:9.11.36-16.el8_10.8 | ALSA-2026:24339 |
| AlmaLinux:9 | bind | 32:9.16.23-40.el9_8.2 | ALSA-2026:24367 |
| AlmaLinux:10 | bind-chroot | 32:9.18.33-15.el10_2.2 | ALSA-2026:24338 |
| AlmaLinux:8 | bind-chroot | 32:9.11.36-16.el8_10.8 | ALSA-2026:24339 |
| AlmaLinux:9 | bind-chroot | 32:9.16.23-40.el9_8.2 | ALSA-2026:24367 |
| AlmaLinux:10 | bind-devel | 32:9.18.33-15.el10_2.2 | ALSA-2026:24338 |
| AlmaLinux:8 | bind-devel | 32:9.11.36-16.el8_10.8 | ALSA-2026:24339 |
| AlmaLinux:9 | bind-devel | 32:9.16.23-40.el9_8.2 | ALSA-2026:24367 |
| AlmaLinux:9 | bind-dnssec-doc | 32:9.16.23-40.el9_8.2 | ALSA-2026:24367 |
| AlmaLinux:10 | bind-dnssec-utils | 32:9.18.33-15.el10_2.2 | ALSA-2026:24338 |
| AlmaLinux:9 | bind-dnssec-utils | 32:9.16.23-40.el9_8.2 | ALSA-2026:24367 |
| AlmaLinux:10 | bind-doc | 32:9.18.33-15.el10_2.2 | ALSA-2026:24338 |
| AlmaLinux:9 | bind-doc | 32:9.16.23-40.el9_8.2 | ALSA-2026:24367 |
| AlmaLinux:8 | bind-export-devel | 32:9.11.36-16.el8_10.8 | ALSA-2026:24339 |
| AlmaLinux:8 | bind-export-libs | 32:9.11.36-16.el8_10.8 | ALSA-2026:24339 |
| AlmaLinux:10 | bind-libs | 32:9.18.33-15.el10_2.2 | ALSA-2026:24338 |
| AlmaLinux:8 | bind-libs | 32:9.11.36-16.el8_10.8 | ALSA-2026:24339 |
| AlmaLinux:9 | bind-libs | 32:9.16.23-40.el9_8.2 | ALSA-2026:24367 |
| AlmaLinux:8 | bind-libs-lite | 32:9.11.36-16.el8_10.8 | ALSA-2026:24339 |
| AlmaLinux:10 | bind-license | 32:9.18.33-15.el10_2.2 | ALSA-2026:24338 |
| AlmaLinux:8 | bind-license | 32:9.11.36-16.el8_10.8 | ALSA-2026:24339 |
| AlmaLinux:9 | bind-license | 32:9.16.23-40.el9_8.2 | ALSA-2026:24367 |
| AlmaLinux:8 | bind-lite-devel | 32:9.11.36-16.el8_10.8 | ALSA-2026:24339 |
| AlmaLinux:8 | bind-pkcs11 | 32:9.11.36-16.el8_10.8 | ALSA-2026:24339 |
| AlmaLinux:8 | bind-pkcs11-devel | 32:9.11.36-16.el8_10.8 | ALSA-2026:24339 |
| AlmaLinux:8 | bind-pkcs11-libs | 32:9.11.36-16.el8_10.8 | ALSA-2026:24339 |
| AlmaLinux:8 | bind-pkcs11-utils | 32:9.11.36-16.el8_10.8 | ALSA-2026:24339 |
| AlmaLinux:8 | bind-sdb | 32:9.11.36-16.el8_10.8 | ALSA-2026:24339 |
| AlmaLinux:8 | bind-sdb-chroot | 32:9.11.36-16.el8_10.8 | ALSA-2026:24339 |
| AlmaLinux:10 | bind-utils | 32:9.18.33-15.el10_2.2 | ALSA-2026:24338 |
| AlmaLinux:8 | bind-utils | 32:9.11.36-16.el8_10.8 | ALSA-2026:24339 |
| AlmaLinux:9 | bind-utils | 32:9.16.23-40.el9_8.2 | ALSA-2026:24367 |
| AlmaLinux:8 | bind9.16 | 32:9.16.23-0.22.el8_10.6 | ALSA-2026:23360 |
| AlmaLinux:8 | bind9.16-chroot | 32:9.16.23-0.22.el8_10.6 | ALSA-2026:23360 |
| AlmaLinux:8 | bind9.16-devel | 32:9.16.23-0.22.el8_10.6 | ALSA-2026:23360 |
| AlmaLinux:8 | bind9.16-dnssec-utils | 32:9.16.23-0.22.el8_10.6 | ALSA-2026:23360 |
| AlmaLinux:8 | bind9.16-doc | 32:9.16.23-0.22.el8_10.6 | ALSA-2026:23360 |
| AlmaLinux:8 | bind9.16-libs | 32:9.16.23-0.22.el8_10.6 | ALSA-2026:23360 |
| AlmaLinux:8 | bind9.16-license | 32:9.16.23-0.22.el8_10.6 | ALSA-2026:23360 |
| AlmaLinux:8 | bind9.16-utils | 32:9.16.23-0.22.el8_10.6 | ALSA-2026:23360 |
| AlmaLinux:9 | bind9.18 | 32:9.18.29-14.el9_8.2 | ALSA-2026:24368 |
| AlmaLinux:9 | bind9.18-chroot | 32:9.18.29-14.el9_8.2 | ALSA-2026:24368 |
| AlmaLinux:9 | bind9.18-devel | 32:9.18.29-14.el9_8.2 | ALSA-2026:24368 |
| AlmaLinux:9 | bind9.18-dnssec-utils | 32:9.18.29-14.el9_8.2 | ALSA-2026:24368 |
| AlmaLinux:9 | bind9.18-doc | 32:9.18.29-14.el9_8.2 | ALSA-2026:24368 |
| AlmaLinux:9 | bind9.18-libs | 32:9.18.29-14.el9_8.2 | ALSA-2026:24368 |
| AlmaLinux:9 | bind9.18-utils | 32:9.18.29-14.el9_8.2 | ALSA-2026:24368 |
| AlmaLinux:8 | python3-bind | 32:9.11.36-16.el8_10.8 | ALSA-2026:24339 |
| AlmaLinux:9 | python3-bind | 32:9.16.23-40.el9_8.2 | ALSA-2026:24367 |
| AlmaLinux:8 | python3-bind9.16 | 32:9.16.23-0.22.el8_10.6 | ALSA-2026:23360 |
| Alpine:v3.20 | bind | 9.18.49-r0 | ALPINE-CVE-2026-3039 |
| Alpine:v3.21 | bind | 9.18.49-r0 | ALPINE-CVE-2026-3039 |
| Alpine:v3.22 | bind | 9.20.23-r0 | ALPINE-CVE-2026-3039 |
| Alpine:v3.23 | bind | 9.20.23-r0 | ALPINE-CVE-2026-3039 |
| Alpine:v3.24 | bind | 9.20.23-r0 | ALPINE-CVE-2026-3039 |
| Debian:12 | bind9 | 1:9.18.49-1~deb12u2 | DEBIAN-CVE-2026-3039 |
| Debian:13 | bind9 | 1:9.20.23-1~deb13u1 | DEBIAN-CVE-2026-3039 |
| Debian:14 | bind9 | 1:9.20.23-1 | DEBIAN-CVE-2026-3039 |
| Rocky Linux:10 | bind | 2:9.18.33-15.el10_2.2 | RLSA-2026:24338 |
| Rocky Linux:8 | bind | 2:9.11.36-16.el8_10.8 | RLSA-2026:24339 |
| Rocky Linux:9 | bind | 2:9.16.23-40.el9_8.2 | RLSA-2026:24367 |
| Rocky Linux:8 | bind9.16 | 2:9.16.23-0.22.el8_10.6 | RLSA-2026:23360 |
| Rocky Linux:9 | bind9.18 | 2:9.18.29-14.el9_8.2 | RLSA-2026:24368 |
| Ubuntu:22.04:LTS | bind9 | 1:9.18.39-0ubuntu0.22.04.4 | UBUNTU-CVE-2026-3039 |
| Ubuntu:24.04:LTS | bind9 | 1:9.18.39-0ubuntu0.24.04.5 | UBUNTU-CVE-2026-3039 |
| Ubuntu:25.10 | bind9 | 1:9.20.11-1ubuntu2.4 | UBUNTU-CVE-2026-3039 |
| Ubuntu:26.04:LTS | bind9 | 1:9.20.18-1ubuntu2.1 | UBUNTU-CVE-2026-3039 |
| Ubuntu:22.04:LTS | bind9-libs | no fix listed | UBUNTU-CVE-2026-3039 |
Affected products (as reported)
Weakness: CWE-771, CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- 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/security/cve/CVE-2026-3039 vdb-entry, x_refsource_REDHAT
- RHBZ#2479767 issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3039.json x_sadp-csaf-vex
- https://access.redhat.com/errata/RHSA-2026:60383 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:62549 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:65851 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:24338 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:24339 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:23360 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:57189 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:55441 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:24367 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:24368 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:20334 vendor-advisory, x_refsource_REDHAT