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 sendin…
Medium CVSS 5.3
Summary
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.
In-depth triage · Auto channel
No in-depth report has been generated yet (DR-003 v2 AI pipeline is under construction).
Affected products
- :
Lint boundary warnings (4)
The following non-blocking warnings were raised during the lint phase of this triage (e.g. reference URLs not yet on the allowlist). They do not affect entry usability and are disclosed for transparency (see DR-002).
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REF_URL_NOT_ALLOWLISTEDurl not in allowlist: https://downloads.isc.org/isc/bind9/9.18.49 -
REF_URL_NOT_ALLOWLISTEDurl not in allowlist: https://downloads.isc.org/isc/bind9/9.20.23 -
REF_URL_NOT_ALLOWLISTEDurl not in allowlist: https://downloads.isc.org/isc/bind9/9.21.22 -
REF_URL_NOT_ALLOWLISTEDurl not in allowlist: https://kb.isc.org/docs/cve-2026-5950
Sources
- NVD DATABASE
Original Links
- https://downloads.isc.org/isc/bind9/9.18.49 Patch
- https://downloads.isc.org/isc/bind9/9.20.23 Patch
- https://downloads.isc.org/isc/bind9/9.21.22 Patch
- https://kb.isc.org/docs/cve-2026-5950 Vendor Advisory
Timeline
- nvd_ingest NVD