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CVE PROGRAM SOURCE RECORD7.5 High

CVE-2026-5946

Invalid handling of CLASS != IN

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Status
Published
Published
Updated
Assigning organization
isc

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

ISC BIND 9

Default version status: unaffected

  • 9.11.0 to ≤ 9.16.50affected
  • 9.18.0 to ≤ 9.18.48affected
  • 9.20.0 to ≤ 9.20.22affected
  • 9.21.0 to ≤ 9.21.21affected
  • 9.11.3-S1 to ≤ 9.16.50-S1affected
  • 9.18.11-S1 to ≤ 9.18.48-S1affected
  • 9.20.9-S1 to ≤ 9.20.22-S1affected

References