CVE-2026-71864Public exploitNetwork attack vector

Code execution via unescaped header parameter name

Published Aug 19, 2026 · Updated Aug 25, 2026

Code injection in Orval before 8.21.0 allows remote attackers to execute JavaScript by supplying a crafted OpenAPI header parameter name. In packages/zod/src/index.ts, header request-validation generation wraps the raw name in double quotes inside zod.object, so a quote closes the key and introduces an evaluated computed property. Execution occurs only when a Zod or Hono client is generated from the untrusted specification and the generated schema module is imported, compromising that developer, CI, test, or application process.

CVSS severity9.3
Critical
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Orval before 8.21.0 allows remote attackers to execute JavaScript by supplying a crafted OpenAPI header parameter name. In packages/zod/src/index.ts, header request-validation generation wraps the raw name in double quotes inside zod.object, so a quote closes the key and introduces an evaluated computed property. Execution occurs only when a Zod or Hono client is generated from the untrusted specification and the generated schema module is imported, compromising that developer, CI, test, or application process.

The record

CVE
CVE-2026-71864
Published
Aug 19, 2026
Updated
Aug 25, 2026
Vendor
Orval
Product
Orval
Classifications
CWE-116, CWE-94, CWE-95, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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.

  1. Affected versionversion=< 8.21.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Orval · Orvalversion=< 8.21.0

Published CVSS scores

9.3GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-116Improper Encoding or Escaping of Output
CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-95Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')
T1059.007JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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