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CVE PROGRAM SOURCE RECORD7.5 High

CVE-2026-11605

Unnecessary validation of DNSSEC signed records

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Status
Published
Published
Updated
Assigning organization
isc

Description

The issue is a resource exhaustion vulnerability associated with DNSSEC validation. BIND always validates all RRSIG records in an answer, even if they are not strictly needed. A query to an authoritative server/zone which returns many valid but superfluous RRSIG records causes the validator to waste disproportionate CPU time. This issue affects BIND 9 versions 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, and 9.20.9-S1 through 9.20.24-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

  • 9.20.0 to ≤ 9.20.24affected
  • 9.21.0 to ≤ 9.21.23affected
  • 9.20.9-S1 to ≤ 9.20.24-S1affected

References