by Kastro
Paper/Archive/CVE-2026-28794

CVE-2026-28794

middleapi orpc — oRPC: Prototype Pollution in `@orpc/client` via `StandardRPCJsonSerializer` Deserialization

EPSS 0.9%public exploitCVSS 9.8
critical.is priorityof 100
52
CVSS 9.8 (NVD)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 61.1.611 × 2012.2Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
orpc< 1.13.6–CNA

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub_M (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

refgithub.com/middleapi/orpc/security/advisories/GHSA-m272-9rp6-32mcrefgithub.com/middleapi/orpc/commit/1dba06fc6f938c2486de303c2fa096bc1c8418b5