GHSA-83x9-vc3c-hghc: OpenSearch has a bypass of REST Layer Authorization Using Malformed Paths

May 7, 2026

A flaw was identified in the OpenSearch REST layer that could allow authorization checks to be bypassed when processing certain malformed HTTP requests. This could permit unauthorized access to restricted API endpoints in environments that rely on REST-layer authorization.

Transport-level authorization is not affected by this issue.

References

github.com/advisories/GHSA-83x9-vc3c-hghc
github.com/opensearch-project/security
github.com/opensearch-project/security/security/advisories/GHSA-83x9-vc3c-hghc

Code Behaviors & Features

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