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.
References9
- github.com/orval-labs/orval
- github.com/orval-labs/orval/blob/v8.28.1/packages/fetch/src/ind…
- github.com/orval-labs/orval/commit/43af282d62dca0ef3140023741fb…
- github.com/orval-labs/orval/commit/a2d4af59f3b167dc8a7a65d15f51…
- github.com/orval-labs/orval/pull/4007
- github.com/orval-labs/orval/security/advisories/GHSA-4q3x-rqfw-…
- github.com/orval-labs/orval/security/advisories/GHSA-rcpr-mq4m-…
- www.vulncheck.com/advisories/orval-before-8.29.0-code-injection…
- github.com/orval-labs/orval/security/advisories/GHSA-4q3x-rqfw-…
Metrics
- CVSS 3.1
-
9.8
CRITICAL
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 4.0
-
9.3
CRITICAL
Score source: CNA
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 - EPSS — exploit probability
- 1% percentile: 57 · as of 9 November 2026
- CWE
- CWE-94
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.