CVE-2026-103918: medium-severity vulnerability in middleapi orpc
@orpc/zod: Prototype injection in smart coercion
Published · Updated
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.5epss 0.2%
exploitation probability
0.2%top 87% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Affected products
middleapi · orpcRelated CVEs — middleapi orpc
In the same product, most dangerous first.
CVE-2026-28794CRITICALoRPC: Prototype Pollution in `@orpc/client` via `StandardRPCJsonSerializer` DeserializationEPSS 1.3%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-2026-103036MEDIUM@orpc/json-schema: Prototype injection in smart coercionEPSS 0.2%