CVE-2026-71864: Orval Remote Code Execution Vulnerability
CRITICALCVE-2026-71864 is a CRITICAL remote code execution vulnerability (CWE-116: Improper Encoding or Escaping of Output) affecting Orval libraries in the npm ecosystem. The issue involves import-time rce via header parameter name -> computed-property-key injection in the zod client. Remediation is available by upgrading affected packages to version 8.21.0.
CVE-2026-71864 at a Glance
How to Fix CVE-2026-71864
To remediate this vulnerability, upgrade all affected Orval dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
npm install orval@8.21.0Run the following command in your project directory to verify that all resolved dependencies use the patched release:
npm ls orvalHow to Check if You Are Affected
To determine whether your Node.js application is affected by CVE-2026-71864, inspect your project dependencies using npm:
npm ls orvalAnalyze the terminal output to locate any version of Orval in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 8.21.0), your application is affected.
Note: The npm ls orval command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-116: Improper Encoding or Escaping of Output, where the product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. as a result, the intended structure of the message is not preserved. In Orval, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-71864 Affected Orval Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
orval
|
npm |
< 8.21.0
|
8.21.0
|
References
Frequently Asked Questions
What is CVE-2026-71864?
Which Orval versions are affected?
What version fixes CVE-2026-71864?
Is orval affected?
What CWE is associated with CVE-2026-71864?
How can I check npm dependencies for CVE-2026-71864?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-6437-gxhq-pqv8",
"modified" : "2026-09-03T18:08:31Z",
"published" : "2026-09-03T18:08:31Z",
"aliases" : [ "CVE-2026-71864" ],
"summary" : "Orval: Import-time RCE via header parameter name -> computed-property-key injection in the zod client",
"details" : "### Summary\n\norval's zod client emits each header parameter name as a double-quoted key in the generated zod.object({...}) request-validation schema WITHOUT escaping the double quote. A \" in the header parameter name closes the key and lands in object-literal context, where an injected computed property key [expr] is evaluated when zod.object({...}) runs -- at MODULE IMPORT (export const OpHeader = zod.object({...}) executes on load) -> import-time RCE. The header parameter name is a pure data field. Verified on orval 8.19.0 / Node.\n\n### Details\n\nexport const OpHeader = zod.object({ \"a\":zod.string(),[require(\"fs\").writeFileSync(\"PWNED\",\"\")]:zod.string(),\"b\": ... })\n\nAlso affects the hono client (reuses zod generation). orval escapes values in zod arrays but not keys in zod.object. Sibling fields: schema property name, query parameter name (CVE-96) (separate reports). Distinct from orval's $ref / route-path / server-url / zod-default findings.\n\n### PoC\n\nreproduce.sh (+ make_spec.py) attached: a header parameter name that breaks the zod.object key and injects a computed key; evaluating it (= importing the module) writes the marker. Verified on 8.19.0.\n\n### Impact\n\nJavaScript / OS command execution at import time for anyone who generates an orval zod client from an attacker-controlled spec and imports it. \n\n### Suggested fix\n\nEscape the header parameter name for the JS string key (JSON.stringify) in the zod.object key generation; never interpolate a raw name adjacent to [ ] in object-literal position.",
"severity" : [ {
"type" : "CVSS_V4",
"score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "npm",
"name" : "orval"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "8.21.0"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/orval-labs/orval/security/advisories/GHSA-6437-gxhq-pqv8"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-71864"
}, {
"type" : "WEB",
"url" : "https://github.com/orval-labs/orval/pull/3692"
}, {
"type" : "WEB",
"url" : "https://github.com/orval-labs/orval/commit/8ef1bfdf3f9bcaf9dabfbe2e42887f1c0e159ab6"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/orval-labs/orval"
}, {
"type" : "WEB",
"url" : "https://github.com/orval-labs/orval/releases/tag/v8.21.0"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-116", "CWE-94", "CWE-95" ],
"severity" : "CRITICAL",
"github_reviewed" : true,
"github_reviewed_at" : "2026-09-03T18:08:31Z",
"nvd_published_at" : "2026-08-19T18:17:23Z"
}
}