High severity7.5NVD Advisory· Published May 20, 2026· Updated May 21, 2026
CVE-2026-5946
CVE-2026-5946
Description
Multiple flaws have been identified in named related to the handling of DNS messages whose CLASS is not Internet (IN) — for example, CHAOS or HESIOD, or DNS messages that specify meta-classes (ANY or NONE) in the question section. Specially crafted requests reaching the affected code paths — recursion, dynamic updates (UPDATE), zone change notifications (NOTIFY), or processing of IN-specific record types in non-IN data — can cause assertion failures in named. This issue affects BIND 9 versions 9.11.0 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, 9.11.3-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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
35cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*+ 1 more
- cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*range: >=9.11.0,<=9.16.50
- (no CPE)range: >=9.11.0, <=9.16.50 || >=9.18.0, <=9.18.48 || >=9.20.0, <=9.20.22 || >=9.21.0, <=9.21.21 || >=9.11.3-S1, <=9.16.50-S1 || >=9.18.11-S1, <=9.18.48-S1 || >=9.20.9-S1, <=9.20.22-S1
- osv-coords32 versionspkg:rpm/almalinux/bindpkg:rpm/almalinux/bind9.16pkg:rpm/almalinux/bind9.16-chrootpkg:rpm/almalinux/bind9.16-develpkg:rpm/almalinux/bind9.16-dnssec-utilspkg:rpm/almalinux/bind9.16-docpkg:rpm/almalinux/bind9.16-libspkg:rpm/almalinux/bind9.16-licensepkg:rpm/almalinux/bind9.16-utilspkg:rpm/almalinux/bind-chrootpkg:rpm/almalinux/bind-develpkg:rpm/almalinux/bind-dnssec-docpkg:rpm/almalinux/bind-dnssec-utilspkg:rpm/almalinux/bind-docpkg:rpm/almalinux/bind-export-develpkg:rpm/almalinux/bind-export-libspkg:rpm/almalinux/bind-libspkg:rpm/almalinux/bind-libs-litepkg:rpm/almalinux/bind-licensepkg:rpm/almalinux/bind-lite-develpkg:rpm/almalinux/bind-pkcs11pkg:rpm/almalinux/bind-pkcs11-develpkg:rpm/almalinux/bind-pkcs11-libspkg:rpm/almalinux/bind-pkcs11-utilspkg:rpm/almalinux/bind-sdbpkg:rpm/almalinux/bind-sdb-chrootpkg:rpm/almalinux/bind-utilspkg:rpm/almalinux/python3-bindpkg:rpm/almalinux/python3-bind9.16pkg:rpm/opensuse/bind&distro=openSUSE%20Tumbleweedpkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/bind&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0
< 32:9.18.33-15.el10_2.2+ 31 more
- (no CPE)range: < 32:9.18.33-15.el10_2.2
- (no CPE)range: < 32:9.16.23-0.22.el8_10.6
- (no CPE)range: < 32:9.16.23-0.22.el8_10.6
- (no CPE)range: < 32:9.16.23-0.22.el8_10.6
- (no CPE)range: < 32:9.16.23-0.22.el8_10.6
- (no CPE)range: < 32:9.16.23-0.22.el8_10.6
- (no CPE)range: < 32:9.16.23-0.22.el8_10.6
- (no CPE)range: < 32:9.16.23-0.22.el8_10.6
- (no CPE)range: < 32:9.16.23-0.22.el8_10.6
- (no CPE)range: < 32:9.18.33-15.el10_2.2
- (no CPE)range: < 32:9.18.33-15.el10_2.2
- (no CPE)range: < 32:9.16.23-40.el9_8.2
- (no CPE)range: < 32:9.18.33-15.el10_2.2
- (no CPE)range: < 32:9.18.33-15.el10_2.2
- (no CPE)range: < 32:9.11.36-16.el8_10.8
- (no CPE)range: < 32:9.11.36-16.el8_10.8
- (no CPE)range: < 32:9.18.33-15.el10_2.2
- (no CPE)range: < 32:9.11.36-16.el8_10.8
- (no CPE)range: < 32:9.18.33-15.el10_2.2
- (no CPE)range: < 32:9.11.36-16.el8_10.8
- (no CPE)range: < 32:9.11.36-16.el8_10.8
- (no CPE)range: < 32:9.11.36-16.el8_10.8
- (no CPE)range: < 32:9.11.36-16.el8_10.8
- (no CPE)range: < 32:9.11.36-16.el8_10.8
- (no CPE)range: < 32:9.11.36-16.el8_10.8
- (no CPE)range: < 32:9.11.36-16.el8_10.8
- (no CPE)range: < 32:9.18.33-15.el10_2.2
- (no CPE)range: < 32:9.11.36-16.el8_10.8
- (no CPE)range: < 32:9.16.23-0.22.el8_10.6
- (no CPE)range: < 9.20.23-1.1
- (no CPE)range: < 9.20.23-160000.1.1
- (no CPE)range: < 9.20.23-160000.1.1
Patches
Vulnerability mechanics
References
4- downloads.isc.org/isc/bind9/9.18.49nvdPatch
- downloads.isc.org/isc/bind9/9.20.23nvdPatch
- downloads.isc.org/isc/bind9/9.21.22nvdPatch
- kb.isc.org/docs/cve-2026-5946nvdVendor Advisory
News mentions
2- ⚡ Weekly Recap: New Linux Flaw, PAN-OS Exploit, AI-Powered Attacks, OAuth Phishing and MoreThe Hacker News · Jun 1, 2026
- BIND 9 Software Vulnerabilities Exposes Resolvers and Authoritative Servers to Remote ExploitsCyber Security News · May 27, 2026