orval-labs Orval up to 8.20.x Zod Schema Generation index.ts formatDefaultValue header code injection

Summaryinfo

A vulnerability classified as critical was found in orval-labs Orval up to 8.20.x. Affected is the function formatDefaultValue of the file packages/zod/src/index.ts of the component Zod Schema Generation. Such manipulation of the argument header leads to code injection. This vulnerability is referenced as CVE-2026-71871. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in orval-labs Orval up to 8.20.x and classified as critical. Affected by this issue is the function formatDefaultValue of the file packages/zod/src/index.ts of the component Zod Schema Generation. The manipulation of the argument header with an unknown input leads to a code injection vulnerability. Using CWE to declare the problem leads to CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Orval generates type-safe JavaScript clients in TypeScript from OpenAPI v3 and Swagger v2 specifications. Prior to 8.21.0, a ${...} expression or backtick in a header parameter default is emitted into a module-level template literal emitted by zod schema generation 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 packages/zod/src/index.ts function formatDefaultValue. This issue is fixed in version 8.21.0.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-71871 since 08/07/2026. The exploitation is known to be easy. The attack may be launched remotely. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.

Upgrading to version 8.21.0 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• orval-labs

Name

• Orval

Version

• 8.0
• 8.1
• 8.2
• 8.3
• 8.4
• 8.5
• 8.6
• 8.7
• 8.8
• 8.9
• 8.10
• 8.11
• 8.12
• 8.13
• 8.14
• 8.15
• 8.16
• 8.17
• 8.18
• 8.19
• 8.20

Website

• Product: https://github.com/orval-labs/orval/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Once again VulDB remains the best source for vulnerability data.

Discussion