---
title: "CVE-2026-23947: Orval has a code injection via unsanitized x-enum-descriptions in enum generation"
url: https://erroneo.us/security/cve/CVE-2026-23947/
description: "CVE-2026-23947 (@orval/core (npm)): Orval generates type-safe JS clients (TypeScript) from any valid OpenAPI v3 or Swagger v2 specification. Versions prior…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-01-20
date_modified: 2026-02-27
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-23947"
kev: false
cvss: 9.3
epss: 0.00832
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-23947: Orval has a code injection via unsanitized x-enum-descriptions in enum generation

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.8% , percentile 57: FIRST’s model estimates a 0.8% chance of exploitation activity in the next 30 days, higher than 57% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes @orval/core (npm) >= 8.0.0-rc.0, < 8.0.2, fixed in 8.0.2 ; @orval/core (npm) < 7.19.0, fixed in 7.19.0 . Check your lockfile, including transitive dependencies.

## What it is

Orval generates type-safe JS clients (TypeScript) from any valid OpenAPI v3 or Swagger v2 specification. Versions prior to 7.19.0 until 8.0.2 are vulnerable to arbitrary code execution in environments consuming generated clients. This issue is similar in nature to CVE-2026-22785, but affects a different code path in @orval/core that was not addressed by CVE-2026-22785's fix. The vulnerability allows untrusted OpenAPI specifications to inject arbitrary TypeScript/JavaScript code into generated clients via the x-enumDescriptions field, which is embedded without proper escaping in getEnumImplementation(). I have confirmed that the injection occurs during const enum generation and results in executable code within the generated schema files. Orval 7.19.0 and 8.0.2 contain a fix for the issue.

## Affected packages

- npm `@orval/core` >= 8.0.0-rc.0, < 8.0.2 → fixed: 8.0.2
- npm `@orval/core` < 7.19.0 → fixed: 7.19.0

## Affected products (CVE record)

- orval-labs orval: >= 8.0.0-rc.0, < 8.0.2, < 7.19.0

## Severity

- GitHub_M CVSS 4.0: 9.3 `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`
- GitHub CVSS 4.0: 9.3 `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`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.83% probability of exploitation activity in the next 30 days; percentile 57.

## Sources

- [GitHub Advisory GHSA-h526-wf6g-67jv](https://github.com/advisories/GHSA-h526-wf6g-67jv)
- [CVE.org record CVE-2026-23947](https://www.cve.org/CVERecord?id=CVE-2026-23947)
- [NVD entry CVE-2026-23947](https://nvd.nist.gov/vuln/detail/CVE-2026-23947)
- [github.com](https://github.com/orval-labs/orval/security/advisories/GHSA-h526-wf6g-67jv)
- [github.com](https://github.com/orval-labs/orval/releases/tag/v8.0.2)
- [github.com](https://github.com/orval-labs/orval/commit/9e5d93533904936678ba93b5d20f6bca176a4e1e)
- [github.com](https://github.com/orval-labs/orval/releases/tag/v7.19.0)

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Source page: https://erroneo.us/security/cve/CVE-2026-23947/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt