open-policy-agent opa-envoy-plugin up to 1.13.2-envoy-1 HTTP Request input.parsed_path authorization

Summaryinfo

A vulnerability marked as critical has been reported in open-policy-agent opa-envoy-plugin up to 1.13.2-envoy-1. Affected by this vulnerability is an unknown functionality of the component HTTP Request Handler. The manipulation of the argument input.parsed_path leads to authorization. This vulnerability is listed as CVE-2026-26205. The attack may be initiated remotely. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in open-policy-agent opa-envoy-plugin up to 1.13.2-envoy-1 and classified as critical. This issue affects an unknown code of the component HTTP Request Handler. The manipulation of the argument input.parsed_path with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to CWE-863. The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

opa-envoy-plugun is a plugin to enforce OPA policies with Envoy. Versions prior to 1.13.2-envoy-2 have a vulnerability in how the `input.parsed_path` field is constructed. HTTP request paths are treated as full URIs when parsed; interpreting leading path segments prefixed with double slashes (`//`) as authority components, and therefore dropping them from the parsed path. This creates a path interpretation mismatch between authorization policies and backend servers, enabling attackers to bypass access controls by crafting requests where the authorization filter evaluates a different path than the one ultimately served. Version 1.13.2-envoy-2 fixes the issue.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-26205 since 02/11/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

Upgrading to version 1.13.2-envoy-2 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 58c44d4ec408d5852d1d0287599e7d5c5e2bc5c3 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• open-policy-agent

Name

• opa-envoy-plugin

Version

• 1.13.2-envoy-1

License

• open-source

Website

• Product: https://github.com/open-policy-agent/opa-envoy-plugin/

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