CVE-2026-103918 · GHSA-gcgf-fh7c-8gf2

@orpc/zod: Prototype injection in smart coercion

Risk score: 47/100
CVSS: 6.5 v3.1
Exploit chance (30 days): 0.2%
Published: 2 Oct 2026

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What to know

What it is: oRPC is a tool that helps build APIs that are end-to-end type-safe and adhere to OpenAPI standards. Prior to 1.14.10, the @orpc/zod ZodSmartCoercionPlugin and experimental_ZodSmartCoercionPlugin collect object and record properties in plain objects and resolve shape keys through the prototype chain. A remote client th…
Affected: @orpc/zod (npm) < 1.14.10
Fix: Upgrade @orpc/zod to 1.14.10 or later.
Exploitation: No known exploitation

Why it is Yellow

CVSS 6.5 medium
On your watchlist: npm

Affected packages

Package	Ecosystem	Vulnerable	Fixed in
@orpc/zod	npm	< 1.14.10	1.14.10

References

Original description

oRPC is a tool that helps build APIs that are end-to-end type-safe and adhere to OpenAPI standards. Prior to 1.14.10, the @orpc/zod ZodSmartCoercionPlugin and experimental_ZodSmartCoercionPlugin collect object and record properties in plain objects and resolve shape keys through the prototype chain. A remote client that can reach a procedure with an object or record input can supply __proto__ to replace the prototype of the returned request object, allowing attacker-controlled inherited values to reach application lookups. For object schemas, keys such as constructor, toString, and __proto__ can instead resolve inherited members as Zod schemas and cause an unhandled TypeError before validation. The global Object.prototype, unrelated objects, other requests, and other users are not modified, and the availability effect is limited to crafted requests rather than persistent process-wide state. This issue is fixed in version 1.14.10.

Last activity 2 Oct 2026. Patch Forecast updates every hour.