CVE-2026-28794: critical vulnerability in middleapi orpc
oRPC: Prototype Pollution in `@orpc/client` via `StandardRPCJsonSerializer` Deserialization
Published · Updated
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28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.3epss 1.1%
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.
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
Affected products
middleapi · orpcRelated CVEs — middleapi orpc
In the same product, most dangerous first.
CVE-2026-77360MEDIUMoRPC: Vary Header Injection in CORS Plugin leading to potential Cache/CORS BypassEPSS 0.5%CVE-2026-33331HIGHoRPC: Stored XSS in OpenAPI Reference Plugin via unescaped JSON.stringifyEPSS 0.3%CVE-2026-103918MEDIUM@orpc/zod: Prototype injection in smart coercionEPSS 0.2%CVE-2026-103036MEDIUM@orpc/json-schema: Prototype injection in smart coercionEPSS 0.2%