CVE-2026-11605

Summary

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 Software

VendorProductVersion RangeStatus
ISCBIND 99.20.0 <= 9.20.24affected
ISCBIND 99.21.0 <= 9.21.23affected
ISCBIND 99.20.9-S1 <= 9.20.24-S1affected

Weaknesses

  • CWE-408: CWE-408 Incorrect Behavior Order - Early Amplification

Workarounds

No workarounds known.

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: partial

References