Vulnerability · Published Sep 23, 2026 · Assigned by VulnCheck
CVE-2026-96757orval before 8.29.0 Code Injection via unescaped OpenAPI media-type
Critical 9.8
In plain English
A critical-severity code injection in orval from orval-labs. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.8%top 42.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
orval before 8.29.0 fails to escape OpenAPI media-type keys when emitting them into single-quoted Content-Type string literals in generated code. Attackers can inject JavaScript through crafted media-type keys in OpenAPI specifications that executes when generated fetch operations or mock resolvers are invoked.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| orval-labs | orval | 6.7.1 – before 8.29.0 |
Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- GitHub Security Advisory (GHSA-4q3x-rqfw-3x8p) vendor-advisory
- GitHub Security Advisory (GHSA-rcpr-mq4m-jx9j) vendor-advisory
- https://github.com/orval-labs/orval/pull/4007 patch, issue-tracking
- https://github.com/orval-labs/orval/commit/43af282d62dca0ef3140023741fb768f6a718adb patch
- https://github.com/orval-labs/orval/commit/a2d4af59f3b167dc8a7a65d15f51cdb89ebe2fe5 patch
- https://github.com/orval-labs/orval/blob/v8.28.1/packages/fetch/src/index.ts#L584 technical-description
- https://github.com/orval-labs/orval product
- VulnCheck Advisory: orval before 8.29.0 Code Injection via unescaped OpenAPI media-type third-party-advisory