CVE-2026-83497: Unrestricted Java Deserialization in OpenSearch SQL Plugin Cursor Pagination

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-31 · updated 2026-09-03
Weakness: CWE-502

Description

Unrestricted deserialization of untrusted data in the cursor pagination component in the OpenSearch SQL plugin allows a remote authenticated user with basic read/search permissions to execute arbitrary code on the server by sending a crafted cursor parameter to the plugins/sql endpoint.

Affected products

AWS Amazon OpenSearch Service: from 2.9 through 3.5
AWS Opensearch: from 2.8 through 3.6

References

https://aws.amazon.com/security/security-bulletins/2026-092-aws/
https://opensearch.org/artifacts/by-version/#release-2-19-6
https://opensearch.org/artifacts/by-version/#release-3-7-0

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