RCE in Orval-Labs Orval
CVE-2026-96757
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.
Vulnerability class: RCE (Remote Code Execution)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.008 (57.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.008 · change: +0.003
Affected products
Weakness classification (CWE)
References
- github.com/orval-labs/orval/security/advisories/GHSA-4q3x-rqfw-3x8p (vendor-advisory)
- github.com/orval-labs/orval/security/advisories/GHSA-rcpr-mq4m-jx9j (vendor-advisory)
- github.com/orval-labs/orval/pull/4007 (issue-tracking, patch)
- github.com/orval-labs/orval/commit/43af282d62dca0ef3140023741fb768f6a718adb (patch)
- github.com/orval-labs/orval/commit/a2d4af59f3b167dc8a7a65d15f51cdb89ebe2fe5 (patch)
- github.com/orval-labs/orval/blob/v8.28.1/packages/fetch/src/index.ts (technical-description)
- github.com/orval-labs/orval (product)
- www.vulncheck.com/advisories/orval-before-8.29.0-code-injection-via-unescaped-o… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-96757?
- CVE-2026-96757 is a critical-severity vulnerability in Orval-Labs Orval, classified under Code Injection. CVSS score: 9.8/10. Published 2026-09-23.
- How severe is CVE-2026-96757?
- Critical severity. CVSS v3 base score is 9.8 out of 10.