Unauthenticated prototype pollution via unchecked deserialization paths
Published Mar 6, 2026 · Updated Mar 6, 2026
Prototype pollution in middleapi oRPC before 1.13.6 allows remote attackers to modify Object.prototype through crafted RPC requests. StandardRPCJsonSerializer.deserialize follows attacker-controlled meta and maps path segments, including proto and constructor, then writes type-constrained or arbitrary string values before schema validation. No authentication or user interaction is required; authorization bypass and code execution require a susceptible property check or gadget, while malformed inherited state can crash the Node.js process.
Summary
What happened
Prototype pollution in middleapi oRPC before 1.13.6 allows remote attackers to modify Object.prototype through crafted RPC requests. StandardRPCJsonSerializer.deserialize follows attacker-controlled meta and maps path segments, including proto and constructor, then writes type-constrained or arbitrary string values before schema validation. No authentication or user interaction is required; authorization bypass and code execution require a susceptible property check or gadget, while malformed inherited state can crash the Node.js process.
The record
- CVE
- CVE-2026-28794
- Published
- Mar 6, 2026
- Updated
- Mar 6, 2026
- Vendor
- middleapi
- Product
- oRPC
- Classifications
- CWE-1321, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 6, 2026CVE publishedPublication date reported by the CVE source.
- Mar 6, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 1.13.6
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Vendor advisory RPC prototype-pollution proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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