CVE-2026-28794 CRITICAL

CVE-2026-28794: oRPC: Prototype Pollution in `@orpc/client` via `StandardRPCJsonSerializer` Deserialization

Vendor Middleapi
Product orpc
Weakness CWE-1321
Published March 6, 2026
Last update March 9, 2026

CVSS base score

9.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 6, 2026 CVE published
March 9, 2026 Record updated