# CVE-2026-63393: OpenSearch SQL plugin: Unsafe cursor deserialization permits server code execution

Status: published. Published: 2026-10-30. Updated: 2026-11-02.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- opensearch-project / sql: >= 2.8.0.0, < 2.19.6.0 (affected); >= 3.0.0.0-alpha1, < 3.7.0.0 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 4.0: 8.7 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: 0.50% as of 2026-11-02; percentile 42.78%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-502

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/opensearch-project/sql/security/advisories/GHSA-r8cv-xvqm-4qj4 (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/opensearch-project/sql/pull/5469 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/opensearch-project/sql/pull/5572 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/opensearch-project/sql/commit/402a284f1dff3545236480b67f860aa93fb667de (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/opensearch-project/sql/commit/9ab50384d3ad571a14211415fba2f6d26d4c80db (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/opensearch-project/sql/releases/tag/2.19.6.0 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/opensearch-project/sql/releases/tag/3.7.0.0 (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-63393; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-63393; retrieved 2026-11-02; source updated Not reported

Revision: b4473a5b6b9ce90145c86247606f9b7c7ca69173ab418647574481282b373997

Canonical: https://y2.dev/cve/CVE-2026-63393

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.