# CVE-2026-12617: Record ordering based unexpected exit with CNAME or DNAME CVE-2026-12617 is fixed in 20 products on 1 platform, first by bind9 1:9.20.24-1ubuntu0.2, released July 22, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-12617 - Priority: High - CVSS: 7.5 (Moderate) - EPSS: 0.0052 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jul 22, 2026 - Weakness: Reachable Assertion - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-12617 ## Description The issue is unexpected program termination based on ordering and/or specific content in responses to queries for CNAME or DNAME, and A records. Specifically, if a client queries for a DNAME and A record below the DNAME to the resolver, and the authoritative server responds positively to the A query but delays the DNAME response and later responds negatively, `named` may quit unexpectedly. Or, if a client queries for a CNAME and A record for the same name to the resolver, and the authoritative server responds positively to the A query but delays the CNAME response and later responds with a self-referential CNAME, the same failure may occur. This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.24, 9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bind amzn 2023 | 32:9.18.50-1.amzn2023.0.2 | [ALAS2023-2026-2040](https://patchblox.com/security/data/fix/linux/alas2023-2026-2040.md) | Aug 3, 2026 | | Linux | bind opensuse-leap 16.0 | 9.20.26-160000.1.1 | [OPENSUSE-SU-2026:21489-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21489-1.md) | Jul 30, 2026 | | Linux | bind sles 15.6 | 9.18.50-150600.3.32.1 | [SUSE-SU-2026:3452-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3452-1.md) | Aug 3, 2026 | | Linux | bind sles 15.7 | 9.20.26-150700.3.29.1 | [SUSE-SU-2026:3426-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3426-1.md) | Jul 30, 2026 | | Linux | bind-chroot amzn 2023 | 32:9.18.50-1.amzn2023.0.2 | [ALAS2023-2026-2040](https://patchblox.com/security/data/fix/linux/alas2023-2026-2040.md) | Aug 3, 2026 | | Linux | bind-debuginfo amzn 2023 | 32:9.18.50-1.amzn2023.0.2 | [ALAS2023-2026-2040](https://patchblox.com/security/data/fix/linux/alas2023-2026-2040.md) | Aug 3, 2026 | | Linux | bind-debugsource amzn 2023 | 32:9.18.50-1.amzn2023.0.2 | [ALAS2023-2026-2040](https://patchblox.com/security/data/fix/linux/alas2023-2026-2040.md) | Aug 3, 2026 | | Linux | bind-devel amzn 2023 | 32:9.18.50-1.amzn2023.0.2 | [ALAS2023-2026-2040](https://patchblox.com/security/data/fix/linux/alas2023-2026-2040.md) | Aug 3, 2026 | | Linux | bind-dnssec-utils amzn 2023 | 32:9.18.50-1.amzn2023.0.2 | [ALAS2023-2026-2040](https://patchblox.com/security/data/fix/linux/alas2023-2026-2040.md) | Aug 3, 2026 | | Linux | bind-dnssec-utils-debuginfo amzn 2023 | 32:9.18.50-1.amzn2023.0.2 | [ALAS2023-2026-2040](https://patchblox.com/security/data/fix/linux/alas2023-2026-2040.md) | Aug 3, 2026 | | Linux | bind-doc amzn 2023 | 32:9.18.50-1.amzn2023.0.2 | [ALAS2023-2026-2040](https://patchblox.com/security/data/fix/linux/alas2023-2026-2040.md) | Aug 3, 2026 | | Linux | bind-libs amzn 2023 | 32:9.18.50-1.amzn2023.0.2 | [ALAS2023-2026-2040](https://patchblox.com/security/data/fix/linux/alas2023-2026-2040.md) | Aug 3, 2026 | | Linux | bind-libs-debuginfo amzn 2023 | 32:9.18.50-1.amzn2023.0.2 | [ALAS2023-2026-2040](https://patchblox.com/security/data/fix/linux/alas2023-2026-2040.md) | Aug 3, 2026 | | Linux | bind-license amzn 2023 | 32:9.18.50-1.amzn2023.0.2 | [ALAS2023-2026-2040](https://patchblox.com/security/data/fix/linux/alas2023-2026-2040.md) | Aug 3, 2026 | | Linux | bind-utils amzn 2023 | 32:9.18.50-1.amzn2023.0.2 | [ALAS2023-2026-2040](https://patchblox.com/security/data/fix/linux/alas2023-2026-2040.md) | Aug 3, 2026 | | Linux | bind-utils-debuginfo amzn 2023 | 32:9.18.50-1.amzn2023.0.2 | [ALAS2023-2026-2040](https://patchblox.com/security/data/fix/linux/alas2023-2026-2040.md) | Aug 3, 2026 | | Linux | bind9 Debian 12.15 (bookworm) | 1:9.18.49-1~deb12u2 | [DEBIAN-CVE-2026-12617](https://patchblox.com/security/data/fix/linux/debian-cve-2026-12617.md) | Jul 23, 2026 | | Linux | bind9 Debian 13.5 (trixie) | 1:9.20.26-1~deb13u1 | [DEBIAN-CVE-2026-12617](https://patchblox.com/security/data/fix/linux/debian-cve-2026-12617.md) | Jul 23, 2026 | | Linux | bind9 Debian 14 | 1:9.20.26-1 | [DEBIAN-CVE-2026-12617](https://patchblox.com/security/data/fix/linux/debian-cve-2026-12617.md) | Jul 23, 2026 | | Linux | bind9 Ubuntu 22.04.1 LTS (jammy) | 1:9.18.39-0ubuntu0.22.04.5 | [bind9 1:9.18.39-0ubuntu0.22.04.5](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-bind9-1-9.18.39-0ubuntu0.22.04.5.md) | Aug 20, 2026 | | Linux | bind9 Ubuntu 24.04.5 LTS (noble) | 1:9.18.39-0ubuntu0.24.04.6 | [bind9 1:9.18.39-0ubuntu0.24.04.6](https://patchblox.com/security/data/fix/linux/ubuntu-noble-bind9-1-9.18.39-0ubuntu0.24.04.6.md) | Aug 20, 2026 | | Linux | bind9 Ubuntu 26.04.1 LTS (resolute) | 1:9.20.24-1ubuntu0.2 | [bind9 1:9.20.24-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-bind9-1-9.20.24-1ubuntu0.2.md) | Jul 22, 2026 | | Linux | bind9-dnsutils Ubuntu 22.04.1 LTS (jammy) | 1:9.18.39-0ubuntu0.22.04.5 | [bind9-dnsutils 1:9.18.39-0ubuntu0.22.04.5](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-bind9-dnsutils-1-9.18.39-0ubuntu0.22.04.5.md) | Aug 20, 2026 | | Linux | bind9-dnsutils Ubuntu 24.04.5 LTS (noble) | 1:9.18.39-0ubuntu0.24.04.6 | [bind9-dnsutils 1:9.18.39-0ubuntu0.24.04.6](https://patchblox.com/security/data/fix/linux/ubuntu-noble-bind9-dnsutils-1-9.18.39-0ubuntu0.24.04.6.md) | Aug 20, 2026 | | Linux | bind9-dnsutils Ubuntu 26.04.1 LTS (resolute) | 1:9.20.24-1ubuntu0.2 | [bind9-dnsutils 1:9.20.24-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-bind9-dnsutils-1-9.20.24-1ubuntu0.2.md) | Jul 22, 2026 | | Linux | bind9-host Ubuntu 22.04.1 LTS (jammy) | 1:9.18.39-0ubuntu0.22.04.5 | [bind9-host 1:9.18.39-0ubuntu0.22.04.5](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-bind9-host-1-9.18.39-0ubuntu0.22.04.5.md) | Aug 20, 2026 | | Linux | bind9-host Ubuntu 24.04.5 LTS (noble) | 1:9.18.39-0ubuntu0.24.04.6 | [bind9-host 1:9.18.39-0ubuntu0.24.04.6](https://patchblox.com/security/data/fix/linux/ubuntu-noble-bind9-host-1-9.18.39-0ubuntu0.24.04.6.md) | Aug 20, 2026 | | Linux | bind9-host Ubuntu 26.04.1 LTS (resolute) | 1:9.20.24-1ubuntu0.2 | [bind9-host 1:9.20.24-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-bind9-host-1-9.20.24-1ubuntu0.2.md) | Jul 22, 2026 | | Linux | bind9-libs Ubuntu 22.04.1 LTS (jammy) | 1:9.18.39-0ubuntu0.22.04.5 | [bind9-libs 1:9.18.39-0ubuntu0.22.04.5](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-bind9-libs-1-9.18.39-0ubuntu0.22.04.5.md) | Aug 20, 2026 | | Linux | bind9-libs Ubuntu 24.04.5 LTS (noble) | 1:9.18.39-0ubuntu0.24.04.6 | [bind9-libs 1:9.18.39-0ubuntu0.24.04.6](https://patchblox.com/security/data/fix/linux/ubuntu-noble-bind9-libs-1-9.18.39-0ubuntu0.24.04.6.md) | Aug 20, 2026 | | Linux | bind9-libs Ubuntu 26.04.1 LTS (resolute) | 1:9.20.24-1ubuntu0.2 | [bind9-libs 1:9.20.24-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-bind9-libs-1-9.20.24-1ubuntu0.2.md) | Jul 22, 2026 | | Linux | bind9-utils Ubuntu 22.04.1 LTS (jammy) | 1:9.18.39-0ubuntu0.22.04.5 | [bind9-utils 1:9.18.39-0ubuntu0.22.04.5](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-bind9-utils-1-9.18.39-0ubuntu0.22.04.5.md) | Aug 20, 2026 | | Linux | bind9-utils Ubuntu 24.04.5 LTS (noble) | 1:9.18.39-0ubuntu0.24.04.6 | [bind9-utils 1:9.18.39-0ubuntu0.24.04.6](https://patchblox.com/security/data/fix/linux/ubuntu-noble-bind9-utils-1-9.18.39-0ubuntu0.24.04.6.md) | Aug 20, 2026 | | Linux | bind9-utils Ubuntu 26.04.1 LTS (resolute) | 1:9.20.24-1ubuntu0.2 | [bind9-utils 1:9.20.24-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-bind9-utils-1-9.20.24-1ubuntu0.2.md) | Jul 22, 2026 | | Linux | bind9utils Ubuntu 22.04.1 LTS (jammy) | 1:9.18.39-0ubuntu0.22.04.5 | [bind9utils 1:9.18.39-0ubuntu0.22.04.5](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-bind9utils-1-9.18.39-0ubuntu0.22.04.5.md) | Aug 20, 2026 | | Linux | bind9utils Ubuntu 24.04.5 LTS (noble) | 1:9.18.39-0ubuntu0.24.04.6 | [bind9utils 1:9.18.39-0ubuntu0.24.04.6](https://patchblox.com/security/data/fix/linux/ubuntu-noble-bind9utils-1-9.18.39-0ubuntu0.24.04.6.md) | Aug 20, 2026 | | Linux | dnsutils Ubuntu 22.04.1 LTS (jammy) | 1:9.18.39-0ubuntu0.22.04.5 | [dnsutils 1:9.18.39-0ubuntu0.22.04.5](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-dnsutils-1-9.18.39-0ubuntu0.22.04.5.md) | Aug 20, 2026 | | Linux | dnsutils Ubuntu 24.04.5 LTS (noble) | 1:9.18.39-0ubuntu0.24.04.6 | [dnsutils 1:9.18.39-0ubuntu0.24.04.6](https://patchblox.com/security/data/fix/linux/ubuntu-noble-dnsutils-1-9.18.39-0ubuntu0.24.04.6.md) | Aug 20, 2026 | --- Data as of 2026-11-09T07:25:28Z UTC. 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