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CVE-2026-13204

If a provably insecure domain is covered by both an NSEC and NSEC3 record at the parent, and there exist an RRSIG for only one of these types, then BIND may exit unexpectedly with an assertion while validating this proof. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:6c89e71832399670a15f9b879f117262bdc9ec23fe2edc0c45f5b556336ae853
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","product":"BIND 9","vendor":"ISC","versions":[{"lessThanOrEqual":"9.18.50","status":"affected","version":"9.11.0","versionType":"custom"},{"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":"9.18.50-S1","status":"affected","version":"9.11.3-S1","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:v2:7f4beb7e72ef87727f5214b0c2c3681e11ceb1e87699f671da76b2421efdc9a5 · sha256:22bb605dbb0bd128… · /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:v2:7f4beb7e72ef87727f5214b0c2c3681e11ceb1e87699f671da76b2421efdc9a5 · sha256:22bb605dbb0bd128… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-617","description":"CWE-617 Reachable Assertion","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7f4beb7e72ef87727f5214b0c2c3681e11ceb1e87699f671da76b2421efdc9a5 · sha256:22bb605dbb0bd128… · /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:v2:7f4beb7e72ef87727f5214b0c2c3681e11ceb1e87699f671da76b2421efdc9a5 · sha256:22bb605dbb0bd128… · /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:v2:7f4beb7e72ef87727f5214b0c2c3681e11ceb1e87699f671da76b2421efdc9a5 · sha256:22bb605dbb0bd128… · /containers/cna/references/2
{"name":"CVE-2026-13204","tags":["vendor-advisory"],"url":"https://kb.isc.org/docs/cve-2026-13204"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7f4beb7e72ef87727f5214b0c2c3681e11ceb1e87699f671da76b2421efdc9a5 · sha256:22bb605dbb0bd128… · /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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