CVE-2026-71871Public exploitNetwork attack vector

Import-time code execution via unescaped template literal

Published Aug 19, 2026 · Updated Aug 19, 2026

Code injection in Orval before 8.21.0 allows attackers to execute JavaScript in generated zod schema imports via crafted header defaults. The packages/zod/src/index.ts formatDefaultValue path emits a header parameter default into a module-level template literal without escaping ${ or backticks, so untrusted OpenAPI data becomes a live expression in the generated module. Reachability requires control of, or influence over, an OpenAPI v3 or Swagger v2 specification processed with zod schema generation; importing the generated schema is enough to run code in developer, CI, test, or application environments.

CVSS severity9.3
Critical
EPSS probability0.48%
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 attackers to execute JavaScript in generated zod schema imports via crafted header defaults. The packages/zod/src/index.ts formatDefaultValue path emits a header parameter default into a module-level template literal without escaping ${ or backticks, so untrusted OpenAPI data becomes a live expression in the generated module. Reachability requires control of, or influence over, an OpenAPI v3 or Swagger v2 specification processed with zod schema generation; importing the generated schema is enough to run code in developer, CI, test, or application environments.

The record

CVE
CVE-2026-71871
Published
Aug 19, 2026
Updated
Aug 19, 2026
Vendor
Orval
Product
Orval
Classifications
CWE-94, CWE-1336, CWE-116, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 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-94Improper Control of Generation of Code ('Code Injection')
CWE-1336Improper Neutralization of Special Elements Used in a Template Engine
CWE-116Improper Encoding or Escaping of Output
T1059.007JavaScript

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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