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.
CVE-2026-96757
CRITICALPre-NVD 9.89.8—Trending — 3 sources updated this weekElevated
EchelonGraph scoreHIGH confidence
Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-23. a secondary CVSS source baseline 9.8; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 9.8Exploit: Elevated riskExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 9.8
- EG Score
- 9.8(high)
- EG Risk
- 75(Attend)EG Risk 75/100SSVC: Attend
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity98% × 45%Exploitation40% × 40%Automatability100% × 15%Action: Remediate soon — notable exploitation risk. - EPSS PROB
- —
- EPSS %ILE
- —
- KEV
- Not listed
Published
September 23, 2026
Last Modified
September 23, 2026
Advisory Details (8)
Auto-updated Sep 23, 2026🔬 Proof of concept available. Patch available. Sources: github_commit, github_pr, github.
github Patch Available🟡 PoC Available
Unescaped OpenAPI Media-Type Key Injects JavaScript into Generated Code · Advisory · orval-labs/orval · GitHub
https://github.com/orval-labs/orval/security/advisories/GHSA-4q3x-rqfw-3x8pgeneric
orval before 8.29.0 Code Injection via unescaped OpenAPI media-type | Advisories | VulnCheck
https://www.vulncheck.com/advisories/orval-before-8.29.0-code-injection-via-unescaped-openapi-media-typegithub Patch Available🟡 PoC Available
@orval/fetch + generateMutatorConfig: Unescaped single-quote injection via requestBody content type key — broken TypeScript in generated files · Advisory · orval-labs/orval · GitHub
Affected: v8.21.0. The same fix pattern (
https://github.com/orval-labs/orval/security/advisories/GHSA-rcpr-mq4m-jx9jgithub_pr Patch Available
Fix/media type key injection
Patch available: orval-labs/orval v8.29.0 (PR #4007 merged 2026-09-06)
https://github.com/orval-labs/orval/pull/4007github_commit Patch Available
commit a2d4af59f3b1 (orval-labs/orval)
Patch available: orval-labs/orval v8.29.0 (contains commit a2d4af59f3b1)
https://github.com/orval-labs/orval/commit/a2d4af59f3b167dc8a7a65d15f51cdb89ebe2fe5github_commit Patch Available
commit 43af282d62dc (orval-labs/orval)
Patch available: orval-labs/orval v8.29.0 (contains commit 43af282d62dc)
https://github.com/orval-labs/orval/commit/43af282d62dca0ef3140023741fb768f6a718adbgeneric
orval/packages/fetch/src/index.ts at v8.28.1 · orval-labs/orval · GitHub
https://github.com/orval-labs/orval/blob/v8.28.1/packages/fetch/src/index.ts#L584generic
GitHub - orval-labs/orval: orval is able to generate client with appropriate type-signatures (TypeScript) from any valid OpenAPI v3 or Swagger v2 specification, either in yaml or json formats. 🍺 · GitHub
https://github.com/orval-labs/orvalVendor Advisories for CVE-2026-96757(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 8× in last 7d / 8× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-09-24 01:58 UTCGHSA enrichment
- 2026-09-23 22:08 UTCEG score recompute
- 2026-09-23 22:08 UTCGHSA enrichment
- 2026-09-23 18:17 UTCEG score recompute
- 2026-09-23 17:54 UTCEG score recompute
- 2026-09-23 17:18 UTCEG score recompute
- 2026-09-23 16:39 UTCEG score recompute
- 2026-09-23 16:39 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Same CWE
10 shownCWE-94
Frequently asked(4)
What is CVE-2026-96757?
CVE-2026-96757 is a critical vulnerability published on September 23, 2026. 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…
When was CVE-2026-96757 disclosed?
CVE-2026-96757 was first published in the National Vulnerability Database on September 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-96757?
CVE-2026-96757 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-96757?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-96757, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-96757
Is Your Infrastructure Affected by CVE-2026-96757?
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