middleapi orpc up to 1.13.5 prototype pollution

Summaryinfo

A vulnerability marked as critical has been reported in middleapi orpc up to 1.13.5. Affected by this vulnerability is an unknown functionality. The manipulation leads to prototype pollution. This vulnerability is listed as CVE-2026-28794. The attack may be initiated remotely. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in middleapi orpc up to 1.13.5. This issue affects an unknown code. The manipulation with an unknown input leads to a prototype pollution vulnerability. Using CWE to declare the problem leads to CWE-1321. The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

oRPC is an tool that helps build APIs that are end-to-end type-safe and adhere to OpenAPI standards. Prior to version 1.13.6, a prototype pollution vulnerability exists in the RPC JSON deserializer of the @orpc/client package. The vulnerability allows unauthenticated, remote attackers to inject arbitrary properties into the global Object.prototype. Because this pollution persists for the lifetime of the Node.js process and affects all objects, it can lead to severe security breaches, including authentication bypass, denial of service, and potentially Remote Code Execution. This issue has been patched in version 1.13.6.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-28794 since 03/03/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059 according to MITRE ATT&CK.

Upgrading to version 1.13.6 eliminates this vulnerability. Applying the patch 1dba06fc6f938c2486de303c2fa096bc1c8418b5 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

• middleapi

Name

• orpc

Version

• 1.13.0
• 1.13.1
• 1.13.2
• 1.13.3
• 1.13.4
• 1.13.5

License

• open-source

Website

• Product: https://github.com/middleapi/orpc/

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