orval MCP client is vulnerable to a code injection attack.

published 2026-01-12 9 mo ago modified 2026-06-17 4 mo ago also GHSA-mwr6-3gp8-9jmj , EUVD-2026-2002

cvss: 9.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits: 0; none known

orval generates type-safe JS clients (TypeScript) from any valid OpenAPI v3 or Swagger v2 specification. Prior to 7.18.0, the MCP server generation logic relies on string manipulation that incorporates the summary field from the OpenAPI specification without proper validation or escaping. This allows an attacker to "break out" of the string literal and inject arbitrary code. This vulnerability is fixed in 7.18.0.

Patch / fix

fixed in 2 links 1

npm @orval/mcp 7.18.0
orval orval 7.18.0

github.com/orval-labs/orval@80b5fe7 commit

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: total
Assessed: 9 mo ago (2026-01-12)

Exploit prediction

0.78% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/orval-labs/orval/security/advisories/GHSA-mwr6-3gp8-9jmj referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	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
CNA	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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
npm	@orval/mcp	<7.18.0	7.18.0

Affected products

orval-labs orval

Classification

Weakness

CWE-77 Improper Neutralization of Special Elements used in a Command

References

github.com /orval-labs/orval/commit/80b5fe73b94f120a3a5561952d6d4b0f8d7e928d
web, patch
github.com /orval-labs/orval/security/advisories/GHSA-mwr6-3gp8-9jmj
web, exploit, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2026-22785
advisory
github.com /orval-labs/orval
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary