CVE-2026-54257

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: 0.4%, top 64% 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
9.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 9.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. From 42.3.1 until 42.3.3, Buffer performs incorrect byte length calculations resulting in heap buffer under/overflow. Most apps will crash and some may perform incorrect buffer allocations in the Node.js Buffer API resulting in unexpected truncation or allocation. This vulnerability is fixed in 42.3.3.

CVSS v3
9.3
EG Score
9.3CRITICALmedium confidence
EG Risk
47
EG Risk 47/100

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%
Exploitation0% × 40%
Automatability30% × 15%
EPSS PROB
0.4%
EPSS %ILE
35th
KEV
Not listed

Published

June 15, 2026

Last Modified

June 25, 2026

Advisory Details (1)

Auto-updated Oct 8, 2026
Patch available. Sources: github.
githubMentions a patch (unverified)

Buffer performs incorrect byte length calculations resulting in heap buffer under/overflow · Advisory · electron/electron · GitHub

https://github.com/electron/electron/security/advisories/GHSA-q6m5-f73j-m9mc

Vendor Advisories for CVE-2026-54257(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
electron—
  • 42.3.1 up to 42.3.3: fixed in 42.3.3
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 26× 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 143 total refreshes for this CVE.

  1. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-08 17:12 UTCEPSS rescore
  3. 2026-10-07 23:48 UTCEPSS rescore
  4. 2026-10-06 15:18 UTCEPSS rescore
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  6. 2026-10-04 23:22 UTCEPSS rescore
  7. 2026-10-03 17:21 UTCOSV refresh
  8. 2026-10-03 14:26 UTCEPSS rescore
  9. 2026-10-02 17:56 UTCEPSS rescore
  10. 2026-10-01 19:50 UTCEPSS rescore
  11. 2026-09-30 15:03 UTCEPSS rescore
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  14. 2026-09-27 13:48 UTCEPSS rescore
  15. 2026-09-26 15:59 UTCEPSS rescore
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  20. 2026-09-17 19:31 UTCEPSS rescore
  21. 2026-09-16 14:08 UTCEPSS rescore
  22. 2026-09-16 05:15 UTCEPSS rescore
  23. 2026-09-14 03:41 UTCEG score recompute
  24. 2026-09-13 16:47 UTCEPSS rescore
  25. 2026-09-11 14:53 UTCEPSS rescore
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  1. 2026-09-10 09:35 UTCEPSS rescore
  2. 2026-09-08 22:01 UTCEPSS rescore
  3. 2026-09-07 16:01 UTCEPSS rescore
  4. 2026-09-06 13:47 UTCEPSS rescore
  5. 2026-09-04 05:06 UTCEPSS rescore
  6. 2026-09-02 14:12 UTCEPSS rescore
  7. 2026-09-01 13:54 UTCEPSS rescore
  8. 2026-09-01 04:40 UTCEPSS rescore
  9. 2026-08-30 22:58 UTCEG score recompute
  10. 2026-08-30 19:17 UTCEPSS rescore
  11. 2026-08-30 01:22 UTCEPSS rescore
  12. 2026-08-28 21:41 UTCEPSS rescore
  13. 2026-08-27 14:25 UTCEPSS rescore
  14. 2026-08-26 14:46 UTCEPSS rescore
  15. 2026-08-25 13:49 UTCEPSS rescore
  16. 2026-08-24 23:32 UTCEG score recompute
  17. 2026-08-23 09:44 UTCEG score recompute
  18. 2026-08-23 00:19 UTCEPSS rescore
  19. 2026-08-21 23:52 UTCEG score recompute
  20. 2026-08-21 23:49 UTCEPSS rescore
  21. 2026-08-21 01:09 UTCEG score recompute
  22. 2026-08-20 22:55 UTCEPSS rescore
  23. 2026-08-20 08:40 UTCEG score recompute
  24. 2026-08-19 17:04 UTCEPSS rescore
  25. 2026-08-19 13:14 UTCEG score recompute
  26. 2026-08-18 13:48 UTCEPSS rescore
  27. 2026-08-17 15:39 UTCEG score recompute
  28. 2026-08-17 13:47 UTCEPSS rescore
  29. 2026-08-16 16:31 UTCEG score recompute
  30. 2026-08-16 14:56 UTCEPSS rescore
  31. 2026-08-16 03:35 UTCEG score recompute
  32. 2026-08-16 02:14 UTCEPSS rescore
  33. 2026-08-15 04:12 UTCEG score recompute
  34. 2026-08-15 01:30 UTCEPSS rescore
  35. 2026-08-13 22:02 UTCEG score recompute
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  37. 2026-08-12 15:43 UTCEG score recompute
  38. 2026-08-12 13:51 UTCEPSS rescore
  39. 2026-08-11 17:36 UTCEG score recompute
  40. 2026-08-11 04:14 UTCEG score recompute
  41. 2026-08-11 00:00 UTCEPSS rescore
  42. 2026-08-09 14:11 UTCEG score recompute
  43. 2026-08-09 13:46 UTCEPSS rescore
  44. 2026-08-08 16:38 UTCEG score recompute
  45. 2026-08-08 16:37 UTCEPSS rescore
  46. 2026-08-07 19:05 UTCEG score recompute
  47. 2026-08-06 17:14 UTCEG score recompute
  48. 2026-08-06 13:47 UTCEPSS rescore
  49. 2026-08-05 19:40 UTCEG score recompute
  50. 2026-08-05 19:17 UTCEPSS rescore
  51. 2026-08-04 15:42 UTCEG score recompute
  52. 2026-08-04 15:10 UTCEPSS rescore
  53. 2026-08-04 10:39 UTCEPSS rescore
  54. 2026-08-03 14:44 UTCEG score recompute
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  56. 2026-08-02 06:35 UTCEG score recompute
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  58. 2026-08-01 08:49 UTCEG score recompute
  59. 2026-08-01 04:16 UTCEPSS rescore
  60. 2026-07-30 23:53 UTCEG score recompute
  61. 2026-07-30 16:28 UTCEPSS rescore
  62. 2026-07-30 09:31 UTCEG score recompute
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  64. 2026-07-30 01:30 UTCEPSS rescore
  65. 2026-07-29 03:24 UTCEG score recompute
  66. 2026-07-28 15:37 UTCEPSS rescore
  67. 2026-07-27 18:18 UTCEG score recompute
  68. 2026-07-26 20:12 UTCEG score recompute
  69. 2026-07-26 14:54 UTCEPSS rescore
  70. 2026-07-25 14:18 UTCEPSS rescore
  71. 2026-07-24 14:18 UTCEPSS rescore
  72. 2026-07-23 14:18 UTCEPSS rescore
  73. 2026-07-23 03:19 UTCEG score recompute
  74. 2026-07-22 14:08 UTCEPSS rescore
  75. 2026-07-21 15:25 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-54257?
CVE-2026-54257 is a critical vulnerability published on June 15, 2026. Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. From 42.3.1 until 42.3.3, Buffer performs incorrect byte length calculations resulting in heap buffer under/overflow. Most apps will crash and some may perform incorrect buffer allocations in the…
When was CVE-2026-54257 disclosed?
CVE-2026-54257 was first published on June 15, 2026, with the most recent update on June 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54257 actively exploited?
CVE-2026-54257 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (35th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54257?
CVE-2026-54257 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-2026-54257?
A fix for CVE-2026-54257 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-54257 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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