CVE-2022-23631

CRITICALNVD 9.09.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.0 under NVD CVSS v3. EPSS exploit probability: 2.3% (82nd 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, nvd
9.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2.3%CVSS: 9.0Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

superjson is a program to allow JavaScript expressions to be serialized to a superset of JSON. In versions prior to 1.8.1 superjson allows input to run arbitrary code on any server using superjson input without prior authentication or knowledge. The only requirement is that the server implements at least one endpoint which uses superjson during request processing. This has been patched in superjson 1.8.1. Users are advised to update. There are no known workarounds for this issue.

CVSS v3
9.0
EG Score
9.0CRITICALmedium confidence
EG Risk
46
EG Risk 46/100CISA 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
Severity90% × 45%
Exploitation2% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or 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
2.3%
EPSS %ILE
83rd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or 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 (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). 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

February 9, 2022

Last Modified

February 24, 2026

Advisory Details (3)

Auto-updated Jul 25, 2026
Patch available. Sources: github.
generic

Remote Code Execution via Prototype Pollution in Blitz.js | Sonar

https://www.sonarsource.com/blog/blitzjs-prototype-pollution/
githubMentions a patch (unverified)

Prototype Pollution leading to Remote Code Execution · Advisory · flightcontrolhq/superjson · GitHub

https://github.com/blitz-js/superjson/security/advisories/GHSA-5888-ffcr-r425
githubMentions a patch (unverified)

Prototype Pollution leading to Remote Code Execution in superjson · CVE-2022-23631 · GitHub Advisory Database · GitHub

https://github.com/advisories/GHSA-5888-ffcr-r425

Affected Packages

(2 across 1 ecosystem)
npm(2)
PackageVulnerable rangeFix by version rangeDependents
blitz—
  • every version up to 0.45.3: fixed in 0.45.3
—
superjson—
  • every version up to 1.8.1: fixed in 1.8.1
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 24× 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.

Showing the most recent 100 of 170 total refreshes for this CVE.

  1. 2026-10-09 20:04 UTCEPSS rescore
  2. 2026-10-08 16:40 UTCEPSS rescore
  3. 2026-10-07 23:45 UTCEPSS rescore
  4. 2026-10-06 15:14 UTCEPSS rescore
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  7. 2026-10-03 14:23 UTCEPSS rescore
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  9. 2026-09-30 15:50 UTCEG score recompute
  10. 2026-09-30 15:00 UTCEPSS rescore
  11. 2026-09-29 15:15 UTCEPSS rescore
  12. 2026-09-27 13:41 UTCEPSS rescore
  13. 2026-09-26 00:22 UTCEPSS rescore
  14. 2026-09-25 06:05 UTCOSV refresh
  15. 2026-09-24 14:00 UTCEPSS rescore
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  20. 2026-09-15 03:06 UTCEPSS rescore
  21. 2026-09-13 16:43 UTCEPSS rescore
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  25. 2026-09-08 21:57 UTCEPSS rescore
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  1. 2026-09-07 15:58 UTCEPSS rescore
  2. 2026-09-06 13:45 UTCEPSS rescore
  3. 2026-09-05 21:21 UTCOSV refresh
  4. 2026-09-05 15:25 UTCEPSS rescore
  5. 2026-09-04 13:57 UTCEPSS rescore
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  9. 2026-08-30 19:14 UTCEPSS rescore
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  11. 2026-08-28 21:38 UTCEPSS rescore
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  20. 2026-08-19 08:29 UTCOSV refresh
  21. 2026-08-18 13:45 UTCEPSS rescore
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  25. 2026-08-15 01:27 UTCEPSS rescore
  26. 2026-08-13 21:57 UTCEPSS rescore
  27. 2026-08-12 13:48 UTCEPSS rescore
  28. 2026-08-09 13:44 UTCEPSS rescore
  29. 2026-08-08 16:34 UTCEPSS rescore
  30. 2026-08-07 16:24 UTCEPSS rescore
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  32. 2026-08-05 19:15 UTCEPSS rescore
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  35. 2026-08-03 10:33 UTCEPSS rescore
  36. 2026-08-02 02:24 UTCEPSS rescore
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  38. 2026-07-30 16:25 UTCEPSS rescore
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  40. 2026-07-28 15:33 UTCEPSS rescore
  41. 2026-07-26 14:52 UTCEPSS rescore
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  43. 2026-07-25 14:15 UTCEPSS rescore
  44. 2026-07-24 14:15 UTCEPSS rescore
  45. 2026-07-23 14:16 UTCEPSS rescore
  46. 2026-07-23 02:08 UTCEG score recompute
  47. 2026-07-22 22:55 UTCEG score recompute
  48. 2026-07-22 14:06 UTCEPSS rescore
  49. 2026-07-22 14:06 UTCEPSS rescore
  50. 2026-07-21 15:22 UTCEPSS rescore
  51. 2026-07-21 15:22 UTCEPSS rescore
  52. 2026-07-20 17:05 UTCEPSS rescore
  53. 2026-07-19 14:29 UTCEPSS rescore
  54. 2026-07-19 02:27 UTCEPSS rescore
  55. 2026-07-18 10:02 UTCEPSS rescore
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  57. 2026-07-17 23:59 UTCOSV refresh
  58. 2026-07-16 17:00 UTCEPSS rescore
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  60. 2026-07-15 16:56 UTCEPSS rescore
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  64. 2026-07-13 22:27 UTCEPSS rescore
  65. 2026-07-13 06:11 UTCEPSS rescore
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  67. 2026-07-12 05:44 UTCEPSS rescore
  68. 2026-07-11 08:25 UTCEPSS rescore
  69. 2026-07-09 19:07 UTCEPSS rescore
  70. 2026-07-08 15:12 UTCEPSS rescore
  71. 2026-07-07 13:44 UTCEPSS rescore
  72. 2026-07-06 16:25 UTCEPSS rescore
  73. 2026-07-06 16:25 UTCEPSS rescore
  74. 2026-07-06 02:21 UTCEPSS rescore
  75. 2026-07-05 02:28 UTCEPSS rescore

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npm:blitz

Frequently asked(5)

What is CVE-2022-23631?
CVE-2022-23631 is a critical vulnerability published on February 9, 2022. superjson is a program to allow JavaScript expressions to be serialized to a superset of JSON. In versions prior to 1.8.1 superjson allows input to run arbitrary code on any server using superjson input without prior authentication or knowledge. The only requirement is that the server implements at…
When was CVE-2022-23631 disclosed?
CVE-2022-23631 was first published on February 9, 2022, with the most recent update on February 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-23631 actively exploited?
CVE-2022-23631 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.3% probability of exploitation in the next 30 days (83rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2022-23631?
CVE-2022-23631 has a CVSS v3 base score of 9.0 (NVD).
How do I remediate CVE-2022-23631?
A fix for CVE-2022-23631 is available: update to the fixed version the vendor names in its advisory.

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