CVE Explorer

CVE-2026-11605

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.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:77191e584af24cb641dd6d5b423c31137519a463bbaa0852f5289f9aa006287e

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"defaultStatus":"unaffected","product":"BIND 9","vendor":"ISC","versions":[{"lessThanOrEqual":"9.20.24","status":"affected","version":"9.20.0","versionType":"custom"},{"lessThanOrEqual":"9.21.23","status":"affected","version":"9.21.0","versionType":"custom"},{"lessThanOrEqual":"9.20.24-S1","status":"affected","version":"9.20.9-S1","versionType":"custom"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:dd0f36a9c7bcc6ac102725b24f0c1576cba5ccf3ee89a39ba38b9d91d212eff2 · sha256:34cf1486f06d1776… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:dd0f36a9c7bcc6ac102725b24f0c1576cba5ccf3ee89a39ba38b9d91d212eff2 · sha256:34cf1486f06d1776… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-408","description":"CWE-408 Incorrect Behavior Order - Early Amplification","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:dd0f36a9c7bcc6ac102725b24f0c1576cba5ccf3ee89a39ba38b9d91d212eff2 · sha256:34cf1486f06d1776… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions

{"tags":["patch"],"url":"https://downloads.isc.org/isc/bind9/9.20.26"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:dd0f36a9c7bcc6ac102725b24f0c1576cba5ccf3ee89a39ba38b9d91d212eff2 · sha256:34cf1486f06d1776… · /containers/cna/references/1

{"tags":["patch"],"url":"https://downloads.isc.org/isc/bind9/9.21.24"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:dd0f36a9c7bcc6ac102725b24f0c1576cba5ccf3ee89a39ba38b9d91d212eff2 · sha256:34cf1486f06d1776… · /containers/cna/references/2

{"name":"CVE-2026-11605","tags":["vendor-advisory"],"url":"https://kb.isc.org/docs/cve-2026-11605"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:dd0f36a9c7bcc6ac102725b24f0c1576cba5ccf3ee89a39ba38b9d91d212eff2 · sha256:34cf1486f06d1776… · /containers/cna/references/0

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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