---
id: CVE-2026-96757
title: >-
  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
summary: >-
  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 t…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-94
vendor: orval-labs
product: orval
affected:
  - orval >= 6.7.1 < 8.29.0
published: '2026-09-23'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T18:17:12.200'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-96757'
references:
  - url: 'https://github.com/orval-labs/orval'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/orval-labs/orval/blob/v8.28.1/packages/fetch/src/index.ts#L584
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/orval-labs/orval/commit/43af282d62dca0ef3140023741fb768f6a718adb
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/orval-labs/orval/commit/a2d4af59f3b167dc8a7a65d15f51cdb89ebe2fe5
    label: disclosure@vulncheck.com
  - url: 'https://github.com/orval-labs/orval/pull/4007'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/orval-labs/orval/security/advisories/GHSA-4q3x-rqfw-3x8p
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/orval-labs/orval/security/advisories/GHSA-rcpr-mq4m-jx9j
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/orval-before-8.29.0-code-injection-via-unescaped-openapi-media-type
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/orval-labs/orval/security/advisories/GHSA-4q3x-rqfw-3x8p
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-23T17:47:51.520475Z'
ingestedAt: '2026-09-23T17:28:14.858Z'
epss: 0.00566
epssPercentile: 0.44571
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.