A flaw in Elasticsearch allows a low-privileged authenticated user to submit a single small request containing a forged opaque identifier. Elasticsearch decodes and deserializes the identifier before confirming that it was legitimately issued by the cluster, and a size value carried inside the identifier drives an allocation that is neither capped nor accounted for by the available memory-usage controls. The resulting out-of-memory condition is fatal and terminates the affected node process, resulting in a denial of service.
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Fixes
Solution
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References
History
Thu, 13 Aug 2026 19:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | A flaw in Elasticsearch allows a low-privileged authenticated user to submit a single small request containing a forged opaque identifier. Elasticsearch decodes and deserializes the identifier before confirming that it was legitimately issued by the cluster, and a size value carried inside the identifier drives an allocation that is neither capped nor accounted for by the available memory-usage controls. The resulting out-of-memory condition is fatal and terminates the affected node process, resulting in a denial of service. | |
| Title | Memory Allocation with Excessive Size Value in Elasticsearch Leading to Denial of Service | |
| Weaknesses | CWE-789 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: elastic
Published:
Updated: 2026-08-13T20:34:33.600Z
Reserved: 2026-08-10T11:17:58.731Z
Link: CVE-2026-72687
No data.
Status : Received
Published: 2026-08-13T20:17:29.460
Modified: 2026-08-13T20:17:29.460
Link: CVE-2026-72687
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OpenCVE Enrichment
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Weaknesses