CVE-2026-70610

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 68% 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
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: None knownExposed: 0

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

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.9, 40.9.2, 41.2.2, and 42.0.0-beta.4, objects copied across the contextBridge boundary from untrusted content could carry an attacker-influenced prototype, enabling prototype-pollution-style attacks against preload code despite context isolation being enabled. Apps are only affected if their preload code accepts object arguments from untrusted content and reads properties from them without own-property checks, while apps that only accept primitive arguments or validate object arguments are not affected. This issue is fixed in 39.8.9, 40.9.2, 41.2.2, and 42.0.0-beta.4.

CVSS v3
5.4
EG Score
5.4(medium)
EG Risk
24(Track)
EG Risk 24/100SSVC: Track

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
Severity54% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
32%
KEV
Not listed

Published

August 5, 2026

Last Modified

August 6, 2026

Advisory Details (10)

Auto-updated Aug 5, 2026
Patch available. Sources: github_pr, github_commit, github_release, github.
github_release Patch Available

electron v39.8.9

Patch available: electron/electron v39.8.9

https://github.com/electron/electron/releases/tag/v39.8.9
github_commit

commit 5b699544cbbe (electron/electron)

Fix landed in electron/electron commit 5b699544cbbe — awaiting tagged release

https://github.com/electron/electron/commit/5b699544cbbed51bedb7c60d75c8c42be5825737
github_commit

commit 4ac50292d552 (electron/electron)

Fix landed in electron/electron commit 4ac50292d552 — awaiting tagged release

https://github.com/electron/electron/commit/4ac50292d552fb510eb778392620c85308770a55
github_commit

commit 23a6efb714de (electron/electron)

Fix landed in electron/electron commit 23a6efb714de — awaiting tagged release

https://github.com/electron/electron/commit/23a6efb714dec80e2cf45d3054d18d701162e4dd
github_commit

commit 17d5d26499cd (electron/electron)

Fix landed in electron/electron commit 17d5d26499cd — awaiting tagged release

https://github.com/electron/electron/commit/17d5d26499cd279fab48f5f26527f8edc02a7713
github_pr

fix: use CreateDataProperty when copying objects across contextBridge

Fix merged in electron/electron PR #51086 on 2026-04-16 — awaiting tagged release

https://github.com/electron/electron/pull/51086
github_pr

fix: use CreateDataProperty when copying objects across contextBridge

Fix merged in electron/electron PR #51085 on 2026-04-16 — awaiting tagged release

https://github.com/electron/electron/pull/51085
github_pr

fix: use CreateDataProperty when copying objects across contextBridge

Fix merged in electron/electron PR #51084 on 2026-04-16 — awaiting tagged release

https://github.com/electron/electron/pull/51084
github_pr

fix: use CreateDataProperty when copying objects across contextBridge

Fix merged in electron/electron PR #51083 on 2026-04-16 — awaiting tagged release

https://github.com/electron/electron/pull/51083
github Patch Available

contextBridge object copy incorrectly honours setters on prototype · Advisory · electron/electron · GitHub

https://github.com/electron/electron/security/advisories/GHSA-ff2p-hmqr-hxm4

Vendor Advisories for CVE-2026-70610(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 rangeFixed inDependents
electron—42.0.0-beta.4—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 32× 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. 2026-08-20 22:56 UTCEPSS rescore
  2. 2026-08-19 20:38 UTCEG score recompute
  3. 2026-08-19 17:04 UTCEPSS rescore
  4. 2026-08-18 21:59 UTCEG score recompute
  5. 2026-08-18 13:49 UTCEPSS rescore
  6. 2026-08-18 13:49 UTCEPSS rescore
  7. 2026-08-17 23:17 UTCEG score recompute
  8. 2026-08-17 13:47 UTCEPSS rescore
  9. 2026-08-17 00:38 UTCEG score recompute
  10. 2026-08-16 14:56 UTCEPSS rescore
  11. 2026-08-16 14:56 UTCEPSS rescore
  12. 2026-08-16 02:15 UTCEPSS rescore
  13. 2026-08-15 03:20 UTCEG score recompute
  14. 2026-08-15 01:31 UTCEPSS rescore
  15. 2026-08-14 04:40 UTCEG score recompute
  16. 2026-08-13 22:00 UTCEPSS rescore
  17. 2026-08-13 06:02 UTCEG score recompute
  18. 2026-08-12 13:51 UTCEPSS rescore
  19. 2026-08-12 07:22 UTCEG score recompute
  20. 2026-08-11 08:43 UTCEG score recompute
  21. 2026-08-11 00:00 UTCEPSS rescore
  22. 2026-08-10 10:04 UTCEG score recompute
  23. 2026-08-09 13:47 UTCEPSS rescore
  24. 2026-08-09 11:26 UTCEG score recompute
  25. 2026-08-08 16:37 UTCEPSS rescore
Show 7 more
  1. 2026-08-08 12:47 UTCEG score recompute
  2. 2026-08-06 15:29 UTCEG score recompute
  3. 2026-08-06 14:46 UTCEG score recompute
  4. 2026-08-06 13:47 UTCEPSS rescore
  5. 2026-08-05 18:30 UTCEG score recompute
  6. 2026-08-05 17:56 UTCEG score recompute
  7. 2026-08-05 17:55 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-70610?
CVE-2026-70610 is a medium vulnerability published on August 5, 2026. Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.9, 40.9.2, 41.2.2, and 42.0.0-beta.4, objects copied across the contextBridge boundary from untrusted content could carry an attacker-influenced prototype, enabling…
When was CVE-2026-70610 disclosed?
CVE-2026-70610 was first published in the National Vulnerability Database on August 5, 2026, with the most recent update on August 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-70610 actively exploited?
CVE-2026-70610 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 68.4% of all scored CVEs.
What is the CVSS score of CVE-2026-70610?
CVE-2026-70610 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-70610?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-70610, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-70610

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