Baitaphish
Security intelligence
SearchLatest briefing
CVE Explorer

CVE-2026-5950

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f7acee2fe261ecb763ecb0e80cf23ec575799fdf569007bd79940c532cbf5ab7
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":"9.18.48","status":"affected","version":"9.18.36","versionType":"custom"},{"lessThanOrEqual":"9.20.22","status":"affected","version":"9.20.8","versionType":"custom"},{"lessThanOrEqual":"9.21.21","status":"affected","version":"9.21.7","versionType":"custom"},{"lessThanOrEqual":"9.18.48-S1","status":"affected","version":"9.18.36-S1","versionType":"custom"},{"lessThanOrEqual":"9.20.22-S1","status":"affected","version":"9.20.9-S1","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:62b086b4afe97344db0f59c0647f5c86e199661e8714eeeb616fb5812e7bb60e · sha256:6a8c6311afdf53a5… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.3,"baseSeverity":"MEDIUM","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:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:62b086b4afe97344db0f59c0647f5c86e199661e8714eeeb616fb5812e7bb60e · sha256:6a8c6311afdf53a5… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-606","description":"CWE-606 Unchecked Input for Loop Condition","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:62b086b4afe97344db0f59c0647f5c86e199661e8714eeeb616fb5812e7bb60e · sha256:6a8c6311afdf53a5… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"tags":["patch"],"url":"https://downloads.isc.org/isc/bind9/9.18.49"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:62b086b4afe97344db0f59c0647f5c86e199661e8714eeeb616fb5812e7bb60e · sha256:6a8c6311afdf53a5… · /containers/cna/references/1
{"tags":["patch"],"url":"https://downloads.isc.org/isc/bind9/9.20.23"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:62b086b4afe97344db0f59c0647f5c86e199661e8714eeeb616fb5812e7bb60e · sha256:6a8c6311afdf53a5… · /containers/cna/references/2
{"tags":["patch"],"url":"https://downloads.isc.org/isc/bind9/9.21.22"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:62b086b4afe97344db0f59c0647f5c86e199661e8714eeeb616fb5812e7bb60e · sha256:6a8c6311afdf53a5… · /containers/cna/references/3
{"name":"CVE-2026-5950","tags":["vendor-advisory"],"url":"https://kb.isc.org/docs/cve-2026-5950"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:62b086b4afe97344db0f59c0647f5c86e199661e8714eeeb616fb5812e7bb60e · sha256:6a8c6311afdf53a5… · /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.

← Back to CVE Explorer