Vulnerability · Published Jul 22, 2026 · Assigned by isc
CVE-2026-13204Unexpected exit in certain situations with NSEC and NSEC3 both present
High 7.5
In plain English
A high-severity security flaw 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 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.5%top 55.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
If a provably insecure domain is covered by both an NSEC and NSEC3 record at the parent, and there exist an RRSIG for only one of these types, then BIND may exit unexpectedly with an assertion while validating this proof. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | bind | 32:9.18.33-15.el10_2.10 | ALSA-2026:55437 |
| AlmaLinux:8 | bind | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:9 | bind | 32:9.16.23-40.el9_8.8 | ALSA-2026:54510 |
| AlmaLinux:10 | bind-chroot | 32:9.18.33-15.el10_2.10 | ALSA-2026:55437 |
| AlmaLinux:8 | bind-chroot | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:9 | bind-chroot | 32:9.16.23-40.el9_8.8 | ALSA-2026:54510 |
| AlmaLinux:10 | bind-devel | 32:9.18.33-15.el10_2.10 | ALSA-2026:55437 |
| AlmaLinux:8 | bind-devel | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:9 | bind-devel | 32:9.16.23-40.el9_8.8 | ALSA-2026:54510 |
| AlmaLinux:9 | bind-dnssec-doc | 32:9.16.23-40.el9_8.8 | ALSA-2026:54510 |
| AlmaLinux:10 | bind-dnssec-utils | 32:9.18.33-15.el10_2.10 | ALSA-2026:55437 |
| AlmaLinux:9 | bind-dnssec-utils | 32:9.16.23-40.el9_8.8 | ALSA-2026:54510 |
| AlmaLinux:10 | bind-doc | 32:9.18.33-15.el10_2.10 | ALSA-2026:55437 |
| AlmaLinux:9 | bind-doc | 32:9.16.23-40.el9_8.8 | ALSA-2026:54510 |
| AlmaLinux:8 | bind-export-devel | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:8 | bind-export-libs | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:10 | bind-libs | 32:9.18.33-15.el10_2.10 | ALSA-2026:55437 |
| AlmaLinux:8 | bind-libs | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:9 | bind-libs | 32:9.16.23-40.el9_8.8 | ALSA-2026:54510 |
| AlmaLinux:8 | bind-libs-lite | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:10 | bind-license | 32:9.18.33-15.el10_2.10 | ALSA-2026:55437 |
| AlmaLinux:8 | bind-license | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:9 | bind-license | 32:9.16.23-40.el9_8.8 | ALSA-2026:54510 |
| AlmaLinux:8 | bind-lite-devel | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:8 | bind-pkcs11 | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:8 | bind-pkcs11-devel | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:8 | bind-pkcs11-libs | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:8 | bind-pkcs11-utils | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:8 | bind-sdb | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:8 | bind-sdb-chroot | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:10 | bind-utils | 32:9.18.33-15.el10_2.10 | ALSA-2026:55437 |
| AlmaLinux:8 | bind-utils | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:9 | bind-utils | 32:9.16.23-40.el9_8.8 | ALSA-2026:54510 |
| AlmaLinux:8 | bind9.16 | 32:9.16.23-0.22.el8_10.12 | ALSA-2026:54509 |
| AlmaLinux:8 | bind9.16-chroot | 32:9.16.23-0.22.el8_10.12 | ALSA-2026:54509 |
| AlmaLinux:8 | bind9.16-devel | 32:9.16.23-0.22.el8_10.12 | ALSA-2026:54509 |
| AlmaLinux:8 | bind9.16-dnssec-utils | 32:9.16.23-0.22.el8_10.12 | ALSA-2026:54509 |
| AlmaLinux:8 | bind9.16-doc | 32:9.16.23-0.22.el8_10.12 | ALSA-2026:54509 |
| AlmaLinux:8 | bind9.16-libs | 32:9.16.23-0.22.el8_10.12 | ALSA-2026:54509 |
| AlmaLinux:8 | bind9.16-license | 32:9.16.23-0.22.el8_10.12 | ALSA-2026:54509 |
| AlmaLinux:8 | bind9.16-utils | 32:9.16.23-0.22.el8_10.12 | ALSA-2026:54509 |
| AlmaLinux:9 | bind9.18 | 32:9.18.29-14.el9_8.8 | ALSA-2026:55442 |
| AlmaLinux:9 | bind9.18-chroot | 32:9.18.29-14.el9_8.8 | ALSA-2026:55442 |
| AlmaLinux:9 | bind9.18-devel | 32:9.18.29-14.el9_8.8 | ALSA-2026:55442 |
| AlmaLinux:9 | bind9.18-dnssec-utils | 32:9.18.29-14.el9_8.8 | ALSA-2026:55442 |
| AlmaLinux:9 | bind9.18-doc | 32:9.18.29-14.el9_8.8 | ALSA-2026:55442 |
| AlmaLinux:9 | bind9.18-libs | 32:9.18.29-14.el9_8.8 | ALSA-2026:55442 |
| AlmaLinux:9 | bind9.18-utils | 32:9.18.29-14.el9_8.8 | ALSA-2026:55442 |
| AlmaLinux:8 | python3-bind | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:9 | python3-bind | 32:9.16.23-40.el9_8.8 | ALSA-2026:54510 |
| AlmaLinux:8 | python3-bind9.16 | 32:9.16.23-0.22.el8_10.12 | ALSA-2026:54509 |
| Alpine:v3.22 | bind | 9.20.26-r0 | ALPINE-CVE-2026-13204 |
| Alpine:v3.23 | bind | 9.20.26-r0 | ALPINE-CVE-2026-13204 |
| Alpine:v3.24 | bind | 9.20.26-r0 | ALPINE-CVE-2026-13204 |
| Debian:12 | bind9 | 1:9.18.49-1~deb12u2 | DEBIAN-CVE-2026-13204 |
| Debian:13 | bind9 | 1:9.20.26-1~deb13u1 | DEBIAN-CVE-2026-13204 |
| Debian:14 | bind9 | 1:9.20.26-1 | DEBIAN-CVE-2026-13204 |
| Rocky Linux:10 | bind | 2:9.18.33-15.el10_2.10 | RLSA-2026:55437 |
| Rocky Linux:8 | bind | 2:9.11.36-16.el8_10.14 | RLSA-2026:54654 |
| Rocky Linux:9 | bind | 2:9.16.23-40.el9_8.8 | RLSA-2026:54510 |
| Rocky Linux:8 | bind9.16 | 2:9.16.23-0.22.el8_10.12 | RLSA-2026:54509 |
| Rocky Linux:9 | bind9.18 | 2:9.18.29-14.el9_8.8 | RLSA-2026:55442 |
| Ubuntu:22.04:LTS | bind9 | 1:9.18.39-0ubuntu0.22.04.6 | USN-8696-1 |
| Ubuntu:22.04:LTS | bind9 | 1:9.18.39-0ubuntu0.22.04.7 | USN-8929-1 |
| Ubuntu:22.04:LTS | bind9 | 1:9.18.39-0ubuntu0.22.04.6 | UBUNTU-CVE-2026-13204 |
| Ubuntu:24.04:LTS | bind9 | 1:9.18.39-0ubuntu0.24.04.7 | USN-8696-1 |
| Ubuntu:24.04:LTS | bind9 | 1:9.18.39-0ubuntu0.24.04.8 | USN-8929-1 |
| Ubuntu:24.04:LTS | bind9 | 1:9.18.39-0ubuntu0.24.04.7 | UBUNTU-CVE-2026-13204 |
| Ubuntu:26.04:LTS | bind9 | 1:9.20.24-1ubuntu0.3 | USN-8696-1 |
| Ubuntu:26.04:LTS | bind9 | 1:9.20.24-1ubuntu0.4 | USN-8929-1 |
| Ubuntu:26.04:LTS | bind9 | 1:9.20.24-1ubuntu0.3 | UBUNTU-CVE-2026-13204 |
| Ubuntu:22.04:LTS | bind9-libs | no fix listed | UBUNTU-CVE-2026-13204 |
| Ubuntu:24.04:LTS | isc-dhcp | no fix listed | UBUNTU-CVE-2026-13204 |
| Ubuntu:26.04:LTS | isc-dhcp | no fix listed | UBUNTU-CVE-2026-13204 |
Affected products (as reported)
Weakness: CWE-617 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- CVE-2026-13204 vendor-advisory
- https://downloads.isc.org/isc/bind9/9.20.26 patch
- https://downloads.isc.org/isc/bind9/9.21.24 patch