EUVD-2026-58249
GHSA-5mjq-6xvh-rmv2
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Network-accessible indexing API requires only low-privilege credentials; no scope change; impact is partial availability degradation of a single node's thread pool with no confidentiality or integrity consequences.
Primary rating from Vendor (elastic).
CVSS VectorVendor: elastic
Lifecycle Timeline
2DescriptionCVE.org
A flaw in Elasticsearch allows a low-privileged authenticated user who can index documents to submit a single small document containing a crafted user-supplied input. Processing one such document occupies a worker thread from a bounded pool for a disproportionate amount of time, degrading the availability of indexing operations on the affected node.
AnalysisAI
Elasticsearch's indexing pipeline contains an algorithmic complexity flaw (CWE-407) that allows any low-privileged authenticated user with document indexing rights to submit a single crafted document that occupies a worker thread in the bounded indexing thread pool for a disproportionate duration, degrading indexing availability on the affected node. Affected versions span both the 8.x and 9.x release lines, with fixes available in 8.19.20 and 9.4.5 per ESA-2026-77. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid Elasticsearch account with document indexing privileges (index:data/write/* or equivalent) on at least one accessible index. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.3 Medium score appropriately reflects a bounded, partial availability impact rather than a total denial-of-service. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade Elasticsearch to version 8.19.20 or later for 8.x deployments, or to version 9.4.5 or later for 9.x deployments, as detailed in the vendor security advisory ESA-2026-77 at https://discuss.elastic.co/t/elasticsearch-8-19-20-9-4-5-security-update-esa-2026-77/389500. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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