CVE-2026-63393: Insecure Deserialization

Description

OpenSearch SQL supports querying OpenSearch data using SQL and Piped Processing Language. In the 2.x line from 2.8.0.0 until 2.19.6.0, and the 3.x line prior to 3.7.0.0, a remote authenticated user with basic read/search permissions can provide a crafted `cursor` parameter to the `plugins/sql` endpoint and trigger unsafe deserialization of untrusted data, resulting in arbitrary code execution on the server. This issue is fixed in repository releases 2.19.6.0 and 3.7.0.0.

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Weakness Type (CWE)

CWE-502 Deserialization of Untrusted Data

References

Other References

https://github.com/opensearch-project/sql/commit/402a284f1dff3545236480b67f860aa93fb667de https://github.com/opensearch-project/sql/commit/9ab50384d3ad571a14211415fba2f6d26d4c80db https://github.com/opensearch-project/sql/pull/5469 https://github.com/opensearch-project/sql/pull/5572 https://github.com/opensearch-project/sql/releases/tag/2.19.6.0 https://github.com/opensearch-project/sql/releases/tag/3.7.0.0 https://github.com/opensearch-project/sql/security/advisories/GHSA-r8cv-xvqm-4qj4

Frequently Asked Questions

What is CVE-2026-63393? +

OpenSearch SQL supports querying OpenSearch data using SQL and Piped Processing Language. In the 2.x line from 2.8.0.0 until 2.19.6.0, and the 3.x line prior to 3.7.0.0, a remote authenticated user with basic read/search permissions can provide a crafted `cursor` parameter to the `plugins/sql` endpoint and trigger unsafe deserialization of untrusted data, resulting in arbitrary code execution on the server. This issue is fixed in repository releases 2.19.6.0 and 3.7.0.0.

How do I check if I'm vulnerable to CVE-2026-63393? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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