EUVD-2026-58250
GHSA-qj5v-cq2v-qvgj
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Network-reachable API with low privileges sufficient to trigger the fault; single request terminates the node, yielding high availability impact with no confidentiality or integrity exposure.
Primary rating from Vendor (elastic).
CVSS VectorVendor: elastic
Lifecycle Timeline
2DescriptionCVE.org
A flaw in Elasticsearch allows a low-privileged authenticated user to submit a single request containing a crafted user-supplied input. A specific internal component validates the input using a recursive routine and applies no bound to the length of the value being validated, so the validation causes the thread to exhaust its stack. The resulting fatal error is not handled by the surrounding execution paths and terminates the affected node process, producing a denial of service.
AnalysisAI
Stack exhaustion in Elasticsearch allows any low-privileged authenticated user to crash an Elasticsearch node with a single crafted request. Affected are all Elasticsearch versions across the 8.x and 9.x release lines, with Elastic releasing fixed versions 8.19.20, 9.4.5, and 9.5.1 under ESA-2026-78. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid low-privileged Elasticsearch account; the CVSS vector PR:L confirms that some form of authentication is mandatory - unauthenticated users cannot reach the vulnerable validation path. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 6.5 (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H) accurately captures the core risk profile: network-exploitable, low complexity, but gated behind a valid low-privileged account. … 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, 9.4.5, or 9.5.1, whichever applies to the deployed branch, as released under Elastic Security Advisory ESA-2026-78 (https://discuss.elastic.co/t/elasticsearch-8-19-20-9-4-5-9-5-1-security-update-esa-2026-78/389505). … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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