BIND DNS Servers Hit by 14 Security Flaws Enabling Cache Poisoning and Remote Crashes
ISC patched 14 high-severity BIND 9 flaws enabling DNS cache poisoning, DNSSEC bypass, and remote crashes of exposed recursive resolvers.
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CVE-2026-5946
- CVSS 3.1
- 7.5 high
- EPSS
- 2%p78
- Published
- ·
- Modified
Description · NVD
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.
- Vendors
- isc
- Products
- bind
- Weakness
- CWE-20, CWE-125, CWE-617, CWE-754, CWE-843, CWE-1287
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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