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CVE PROGRAM SOURCE RECORD5.3 Medium

CVE-2026-5950

Unbounded resend loop in BIND 9 resolver

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Status
Published
Published
Updated
Assigning organization
isc

Description

An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions. This issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-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

  • 9.18.36 to ≤ 9.18.48affected
  • 9.20.8 to ≤ 9.20.22affected
  • 9.21.7 to ≤ 9.21.21affected
  • 9.18.36-S1 to ≤ 9.18.48-S1affected
  • 9.20.9-S1 to ≤ 9.20.22-S1affected

References