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orval CVE-2026-96757

| EUVDEUVD-2026-85407 CRITICAL
Code Injection (CWE-94)
2026-09-23 VulnCheck GHSA-2hg7-crf6-4xp2
9.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
9.3 CRITICAL
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
vuln.today AI
8.8 HIGH

Attacker-supplied spec is remote (AV:N) and simple (AC:L, PR:N), but a developer must run codegen and execute the generated output, so UI:R; injected JS yields full C/I/A.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

4
POC Analysis Generated
Sep 23, 2026 - 19:27 vuln.today
Metadata Corrected
Sep 23, 2026 - 17:40 vuln.today
tag: TypeScript added
Analysis Generated
Sep 23, 2026 - 17:08 vuln.today
CVE Published
Sep 23, 2026 - 16:23 cve.org
CRITICAL 9.3

DescriptionCVE.org

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.

AnalysisAI

Code injection in orval before 8.29.0 lets an attacker who controls or influences the OpenAPI specification being processed smuggle executable JavaScript into the generated client: media-type (Content-Type) keys are written into single-quoted string literals without escaping, so punctuation in a crafted key terminates the literal and injects arbitrary statements into the emitted code. The CVSS 4.0 vector (AV:N/AC:L/PR:N/UI:N, C:H/I:H/A:H) makes this an unauthenticated remote code-injection flaw at 9.3, but exploitation in practice is gated by the victim actually running orval over the malicious spec and then invoking the generated fetch operation or mock resolver - our independent assessment therefore applies UI:R (CVSS 3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H), and teams that only generate clients from their own trusted specifications are not realistically exposed. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Delivery
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Execution
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Vulnerability AssessmentAI

Exploitation Exploitation requires that a victim run orval (any version before 8.29.0) to generate code from an OpenAPI specification that the attacker can influence - the specific trigger is an OpenAPI media-type (Content-Type) key containing statement-breaking punctuation that escapes the single-quoted string literal orval emits. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The vendor/VulnCheck CVSS 4.0 score is 9.3 (AV:N/AC:L/PR:N/UI:N/VC:H/VI:H/VA:H), which frames this as a critical, remote, unauthenticated code-injection flaw. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade to orval 8.29.0 or later - vendor-released patch: 8.29.0 - which sanitizes media-type-derived suffixes, substitutes the `Content` fallback when no identifier-safe characters remain, and de-duplicates colliding suffixes; the underlying changes are in PR 4007 and commits 43af282d62dca0ef3140023741fb768f6a718adb and a2d4af59f3b167dc8a7a65d15f51cdb89ebe2fe5 (`https://github.com/orval-labs/orval/pull/4007`, references also at `https://github.com/orval-labs/orval/blob/v8.28.1/packages/fetch/src/index.ts#L584`). … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, identify all projects using orval versions before 8.29.0 and upgrade to 8.29.0 or later; if immediate upgrade is not possible, temporarily restrict orval usage to only trusted, internally controlled OpenAPI specifications and avoid processing specs from external sources. …

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I analyzed the provided intelligence and produced the synthesis below. One thing to flag first: **⚠️ Prompt-injection n

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CVE-2026-96757 vulnerability details – vuln.today

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