CVE-2026-70604: Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS

Q: How do I fix CVE-2026-70604?

electron: upgrade to 39.8.10, 40.9.3, 41.4.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-70604 being exploited?

CVE-2026-70604 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-70604 affect?

CVE-2026-70604 affects electron. Severity is high (CVSS 7.4). Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.10, 40.9.3, 41.4.0, and 42.0.0, a custom scheme registered with supportFetchAPI: true but without corsEnabled: true was no

Routine

HIGH 7.4UPGRADE

CVE-2026-70604 is a high-severity flaw (CVSS 7.4) affecting electron. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.10, 40.9.3, 41.4.0, and 42.0.0, a custom scheme registered with supportFetchAPI: true but without corsEnabled: true was not subject to CORS enforcement. A page loaded from a remote origin could therefore fetch() or XMLHttpRequest that scheme cross-origin and read the full response body, rather than the read being blocked. Apps tha

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.4 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 71%)
CISA exploited list	No
Weakness	CWE-942
Published	2026-08-05
Last modified	2026-10-08

Publisher (CNA): GitHub, Inc. · Vendor: electronjs

Last updated 2026-10-08 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-05 16:17 UTCPublished CVE record published
2026-10-08 13:53 UTCUpdated Record last modified

electronjs electron UPGRADE

Affected: < 39.8.10 · >= 40.0.0 and < 40.9.3 · >= 41.0.0 and < 41.4.0 · 42.0.0 alpha1 · 42.0.0 alpha2 · 42.0.0 alpha3 · 42.0.0 alpha4 · 42.0.0 alpha5

Fixed in: 39.8.10, 40.9.3, 41.4.0

Safe to downgrade to: a release before 40.0.0

1. Check installed version

npm ls electron

2. UPGRADE to 39.8.10

npm install electron@">=39.8.10"

3. If no update is available yet, DOWNGRADE to a release before 40.0.0

npm view electron versions npm install electron@"<40.0.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-70604?

electron: upgrade to 39.8.10, 40.9.3, 41.4.0. Exact commands for each OS are on this page.

Is CVE-2026-70604 being exploited?

CVE-2026-70604 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-70604 affect?

CVE-2026-70604 affects electron. Severity is high (CVSS 7.4). Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.10, 40.9.3, 41.4.0, and 42.0.0, a custom scheme registered with supportFetchAPI: true but without corsEnabled: true was no

How urgent is CVE-2026-70604?

Priority 33/100. High severity

Software pages

Electron vulnerabilities

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References

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