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CVE-2026-63140

Reachable Assertion (CWE-617) in Elasticsearch can lead to denial of service via Input Data Manipulation (CAPEC-153). A specially crafted search request containing a null value in a specific query clause causes an internal assertion to be raised during query parsing. Because Elasticsearch treats assertion failures as fatal errors, this terminates the affected node process. A low-privileged authenticated user with read access to at least one index can exploit this condition with a single request
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:348a0300e04005b35343fe69b02b2a869362526e71e28a579db45cbf0ff7a5b4
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","product":"Elasticsearch","vendor":"Elastic","versions":[{"lessThanOrEqual":"9.3.7","status":"affected","version":"9.0.0","versionType":"semver"},{"lessThanOrEqual":"9.4.3","status":"affected","version":"9.4.0","versionType":"semver"},{"lessThanOrEqual":"8.19.18","status":"affected","version":"8.0.0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8996b6b7d26b2f43a44062f593ab99a613c5270a9283def5386293a8a00aa75d · sha256:ed0d0cdc0c2cdc5f… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/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:v2:8996b6b7d26b2f43a44062f593ab99a613c5270a9283def5386293a8a00aa75d · sha256:ed0d0cdc0c2cdc5f… · /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:v2:8996b6b7d26b2f43a44062f593ab99a613c5270a9283def5386293a8a00aa75d · sha256:ed0d0cdc0c2cdc5f… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"url":"https://discuss.elastic.co/t/elasticsearch-8-19-19-9-3-8-9-4-4-security-update-esa-2026-64/388565"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8996b6b7d26b2f43a44062f593ab99a613c5270a9283def5386293a8a00aa75d · sha256:ed0d0cdc0c2cdc5f… · /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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