CVE-2026-71864 orval-labs CVE debrief

Who should care

Developers and users of Orval, especially those who generate type-safe JavaScript clients in TypeScript from OpenAPI v3 and Swagger v2 specifications, should be aware of this vulnerability and take necessary actions to mitigate it.

Technical summary

The Orval library, used for generating type-safe JavaScript clients in TypeScript from OpenAPI v3 and Swagger v2 specifications, contains a vulnerability in versions prior to 8.21.0. This vulnerability allows for code execution in the developer, CI, test, or application environment due to improper encoding of double quotes in header parameter names within the generated zod schema. The affected code is in packages/zod/src/index.ts and header request-validation generation. The issue is addressed in version 8.21.0. Developers and users of Orval should review and validate generated zod schema modules for potential vulnerabilities and implement additional security measures to prevent code execution in development environments. The vulnerability has a CVSS score of 9.3 and is classified as CRITICAL, emphasizing the need for prompt mitigation efforts. The CVE record was published on 2026-08-19T18:17:23.313Z and has not been modified since then, ensuring that the information remains current and relevant for affected parties. The NVD entry for this vulnerability is currently 9.3 CRITICAL, further highlighting its severity and the importance of addressing it promptly. To mitigate this vulnerability, it is essential to update to Orval version 8.21.0 or later and review the generated zod schema modules for any potential security risks. Additionally, implementing compensating controls and monitoring for exposed assets can help prevent exploitation while remediation is in progress. By taking these steps, developers and users of Orval can effectively mitigate the risks associated with CVE-2026-71864 and protect their environments from potential code execution attacks. The CVE-2026-71864 issue arises from Orval's generation of type-safe JavaScript clients in TypeScript from OpenAPI v3 and Swagger v2 specifications. Prior to version 8.21.0, a double quote in a header parameter name is emitted into the generated request-validation zod.object({...}) schema without safe encoding. This permits attacker-controlled JavaScript to be evaluated when the generated zod schema module is imported, resulting in code execution in the developer, CI, test, or application environment. The issue 8

Defensive priority

Developers and users of Orval should prioritize updating to version 8.21.0 or later to mitigate this vulnerability.

Recommended defensive actions

• Update to Orval version 8.21.0 or later
• Review and validate generated zod schema modules for potential vulnerabilities
• Implement additional security measures to prevent code execution in development environments
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE-2026-71864 issue arises from Orval's generation of type-safe JavaScript clients in TypeScript from OpenAPI v3 and Swagger v2 specifications. Prior to version 8.21.0, a double quote in a header parameter name is emitted into the generated request-validation zod.object({...}) schema without safe encoding. This permits attacker-controlled JavaScript to be evaluated when the generated zod schema module is imported, resulting in code execution in the developer, CI, test, or application environment. The affected code is in packages/zod/src/index.ts and header request-validation generation. This issue is fixed in version 8.21.0.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.