CVE-2026-71871

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: 0.7% (49th percentile of EPSS-scored CVEs). 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
9.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 9.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Orval generates type-safe JavaScript clients in TypeScript from OpenAPI v3 and Swagger v2 specifications. Prior to 8.21.0, a ${...} expression or backtick in a header parameter default is emitted into a module-level template literal emitted by zod schema generation 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 function formatDefaultValue. This issue is fixed in version 8.21.0.

CVSS v3
9.3
EG Score
9.3CRITICALmedium confidence
EG Risk
57
EG Risk 57/100CISA SSVC

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%
Exploitation1% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.7%
EPSS %ILE
49th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 19, 2026

Last Modified

September 9, 2026

Advisory Details (4)

Auto-updated Oct 3, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github, github_commit, github_pr.
githubMentions a patch (unverified)🟡 PoC Available

[SECURITY] Import-time RCE via header-parameter default -> zod module-level template literal · Advisory · orval-labs/orval · GitHub

https://github.com/orval-labs/orval/security/advisories/GHSA-8j6p-r8jg-mxqh
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

Vendor Advisories for CVE-2026-71871(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
orval—
  • every version up to 8.21.0: fixed in 8.21.0
—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 46× 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. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-08 17:13 UTCEPSS rescore
  3. 2026-10-08 07:44 UTCEG score recompute
  4. 2026-10-07 23:48 UTCEPSS rescore
  5. 2026-10-06 16:58 UTCEG score recompute
  6. 2026-10-06 15:18 UTCEPSS rescore
  7. 2026-10-05 17:54 UTCEG score recompute
  8. 2026-10-05 17:43 UTCEPSS rescore
  9. 2026-10-05 01:45 UTCEG score recompute
  10. 2026-10-04 23:22 UTCEPSS rescore
  11. 2026-10-03 16:55 UTCEG score recompute
  12. 2026-10-03 14:26 UTCEPSS rescore
  13. 2026-10-02 21:36 UTCEG score recompute
  14. 2026-10-01 22:47 UTCEG score recompute
  15. 2026-10-01 19:50 UTCEPSS rescore
  16. 2026-09-30 20:35 UTCEG score recompute
  17. 2026-09-30 15:03 UTCEPSS rescore
  18. 2026-09-30 08:43 UTCEG score recompute
  19. 2026-09-28 21:42 UTCEG score recompute
  20. 2026-09-28 13:52 UTCEPSS rescore
  21. 2026-09-27 16:09 UTCEG score recompute
  22. 2026-09-27 13:48 UTCEPSS rescore
  23. 2026-09-27 06:56 UTCEG score recompute
  24. 2026-09-26 15:59 UTCEPSS rescore
  25. 2026-09-24 16:16 UTCEG score recompute
Show 62 more
  1. 2026-09-23 20:09 UTCEG score recompute
  2. 2026-09-23 17:54 UTCEPSS rescore
  3. 2026-09-22 19:50 UTCEG score recompute
  4. 2026-09-21 22:34 UTCEG score recompute
  5. 2026-09-21 21:09 UTCEPSS rescore
  6. 2026-09-19 18:32 UTCEG score recompute
  7. 2026-09-18 21:45 UTCEG score recompute
  8. 2026-09-18 19:28 UTCEPSS rescore
  9. 2026-09-17 21:30 UTCEG score recompute
  10. 2026-09-16 14:33 UTCEG score recompute
  11. 2026-09-16 14:08 UTCEPSS rescore
  12. 2026-09-16 09:50 UTCEG score recompute
  13. 2026-09-16 05:15 UTCEPSS rescore
  14. 2026-09-15 03:55 UTCEG score recompute
  15. 2026-09-15 03:12 UTCEPSS rescore
  16. 2026-09-13 17:47 UTCEG score recompute
  17. 2026-09-12 17:40 UTCEG score recompute
  18. 2026-09-12 15:02 UTCEPSS rescore
  19. 2026-09-11 17:34 UTCEG score recompute
  20. 2026-09-11 14:53 UTCEPSS rescore
  21. 2026-09-11 12:59 UTCEG score recompute
  22. 2026-09-10 12:19 UTCEG score recompute
  23. 2026-09-10 09:35 UTCEPSS rescore
  24. 2026-09-09 02:35 UTCEG score recompute
  25. 2026-09-08 22:01 UTCEPSS rescore
  26. 2026-09-07 19:42 UTCEG score recompute
  27. 2026-09-06 16:18 UTCEG score recompute
  28. 2026-09-06 13:48 UTCEPSS rescore
  29. 2026-09-05 16:02 UTCEG score recompute
  30. 2026-09-04 15:21 UTCEG score recompute
  31. 2026-09-04 07:16 UTCEG score recompute
  32. 2026-09-04 05:07 UTCEPSS rescore
  33. 2026-09-02 21:18 UTCEG score recompute
  34. 2026-09-02 14:12 UTCEPSS rescore
  35. 2026-09-01 17:15 UTCEG score recompute
  36. 2026-09-01 13:54 UTCEPSS rescore
  37. 2026-09-01 08:17 UTCEG score recompute
  38. 2026-09-01 04:40 UTCEPSS rescore
  39. 2026-08-30 22:11 UTCEG score recompute
  40. 2026-08-30 19:17 UTCEPSS rescore
  41. 2026-08-30 02:02 UTCEG score recompute
  42. 2026-08-30 01:22 UTCEPSS rescore
  43. 2026-08-29 01:49 UTCEG score recompute
  44. 2026-08-28 21:42 UTCEPSS rescore
  45. 2026-08-27 15:40 UTCEG score recompute
  46. 2026-08-26 15:20 UTCEG score recompute
  47. 2026-08-26 14:47 UTCEPSS rescore
  48. 2026-08-25 14:58 UTCEG score recompute
  49. 2026-08-25 13:49 UTCEPSS rescore
  50. 2026-08-24 14:51 UTCEG score recompute
  51. 2026-08-24 10:49 UTCEG score recompute
  52. 2026-08-23 02:34 UTCEG score recompute
  53. 2026-08-23 00:19 UTCEPSS rescore
  54. 2026-08-22 02:27 UTCEG score recompute
  55. 2026-08-21 23:49 UTCEPSS rescore
  56. 2026-08-21 22:26 UTCEG score recompute
  57. 2026-08-21 22:00 UTCEG score recompute
  58. 2026-08-21 02:40 UTCEG score recompute
  59. 2026-08-20 22:56 UTCEPSS rescore
  60. 2026-08-19 18:29 UTCEG score recompute
  61. 2026-08-19 17:43 UTCEG score recompute
  62. 2026-08-19 17:42 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-71871?
CVE-2026-71871 is a critical vulnerability published on August 19, 2026. Orval generates type-safe JavaScript clients in TypeScript from OpenAPI v3 and Swagger v2 specifications. Prior to 8.21.0, a ${...} expression or backtick in a header parameter default is emitted into a module-level template literal emitted by zod schema generation without safe encoding. This…
When was CVE-2026-71871 disclosed?
CVE-2026-71871 was first published on August 19, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-71871 actively exploited?
CVE-2026-71871 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (49th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-71871?
CVE-2026-71871 has a CVSS base score of 9.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-71871?
A fix for CVE-2026-71871 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-71871 are linked in the Vendor Advisories panel on this page.

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