CVE-2026-71866

CRITICALPre-NVD 9.39.3—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 61% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this weekElevated
9.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.3Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Orval generates type-safe JavaScript clients in TypeScript from OpenAPI v3 and Swagger v2 specifications. From version 8.19.0 until 8.21.0, a double quote in a schema property name is emitted into the generated zod.object({...}) schema without safe encoding. This permits attacker-controlled JavaScript to be evaluated when the generated zod schema module is imported, resulting in code execution in the developer, CI, test, or application environment. The affected code is packages/zod/src/index.ts and zod object-key generation. This issue is fixed in version 8.21.0.

CVSS v3
9.3
EG Score
9.3(medium)
EG Risk
73(Attend)
EG Risk 73/100SSVC: 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 computed
Severity93% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
39%
KEV
Not listed

Published

August 19, 2026

Last Modified

August 19, 2026

Advisory Details (4)

Auto-updated Aug 23, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github, github_commit, github_pr.
github Patch Available🟡 PoC Available

Import-time RCE via schema property name -> computed-property-key injection in the zod client · Advisory · orval-labs/orval · GitHub

https://github.com/orval-labs/orval/security/advisories/GHSA-6mr6-jvcr-2f25
github_release Patch Available

Release v8.21.0

Patch available: orval-labs/orval v8.21.0

https://github.com/orval-labs/orval/releases/tag/v8.21.0
github_pr Patch Available

fix: escape spec-controlled strings in generated template literals and object keys

Patch available: orval-labs/orval v8.21.0 (PR #3692 merged 2026-07-12)

https://github.com/orval-labs/orval/pull/3692
github_commit Patch Available

commit 8ef1bfdf3f9b (orval-labs/orval)

Patch available: orval-labs/orval v8.21.0 (contains commit 8ef1bfdf3f9b)

https://github.com/orval-labs/orval/commit/8ef1bfdf3f9bcaf9dabfbe2e42887f1c0e159ab6

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 15× in last 7d / 15× 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.

  1. 2026-08-25 16:36 UTCEG score recompute
  2. 2026-08-25 13:49 UTCEPSS rescore
  3. 2026-08-24 17:26 UTCEG score recompute
  4. 2026-08-24 09:49 UTCEG score recompute
  5. 2026-08-23 03:11 UTCEG score recompute
  6. 2026-08-23 00:19 UTCEPSS rescore
  7. 2026-08-22 00:21 UTCEG score recompute
  8. 2026-08-21 23:49 UTCEPSS rescore
  9. 2026-08-21 01:27 UTCEG score recompute
  10. 2026-08-20 22:56 UTCEPSS rescore
  11. 2026-08-19 22:18 UTCEG score recompute
  12. 2026-08-19 18:29 UTCEG score recompute
  13. 2026-08-19 18:13 UTCEG score recompute
  14. 2026-08-19 17:43 UTCEG score recompute
  15. 2026-08-19 17:42 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-71866?
CVE-2026-71866 is a critical vulnerability published on August 19, 2026. Orval generates type-safe JavaScript clients in TypeScript from OpenAPI v3 and Swagger v2 specifications. From version 8.19.0 until 8.21.0, a double quote in a schema property name is emitted into the generated zod.object({...}) schema without safe encoding. This permits attacker-controlled…
When was CVE-2026-71866 disclosed?
CVE-2026-71866 was first published in the National Vulnerability Database on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-71866 actively exploited?
CVE-2026-71866 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 60.8% of all scored CVEs.
What is the CVSS score of CVE-2026-71866?
CVE-2026-71866 has a CVSS v3 base score of 9.3 (NVD).
How do I remediate CVE-2026-71866?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-71866, 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.

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