CVE-2026-70612: Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS

Q: How do I fix CVE-2026-70612?

electron: upgrade to 39.8.8, 40.9.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-70612 being exploited?

CVE-2026-70612 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-2026-70612 affect?

CVE-2026-70612 affects electron. Severity is medium (CVSS 5.4). Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.8, 40.9.0, 41.2.1, and 42.0.0-beta.3, requests to open external protocol URLs from web content did not take iframe sandbox

Q: How urgent is CVE-2026-70612?

Priority 33/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.4REMOTEUPGRADE

CVE-2026-70612 is a medium-severity flaw (CVSS 5.4) 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 39.8.8, 40.9.0, 41.2.1, and 42.0.0-beta.3, requests to open external protocol URLs from web content did not take iframe sandbox restrictions into account, so a sandboxed iframe could cause an OS-registered external application to be launched. The frame sandbox state was also not made available to the app permission handlers, affecting

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 63%)
CISA exploited list	No
Weakness	CWE-284
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 19:17 UTCPublished CVE record published
2026-10-08 13:49 UTCUpdated Record last modified

electronjs electron UPGRADE

Affected: < 39.8.8 · >= 40.0.0 and < 40.9.0 · >= 41.0.0 and <= 41.2.1 · 42.0.0 alpha1 · 42.0.0 alpha2 · 42.0.0 alpha3 · 42.0.0 alpha4 · 42.0.0 alpha5

Fixed in: 39.8.8, 40.9.0

Safe to downgrade to: a release before 40.0.0

1. Check installed version

npm ls electron

2. UPGRADE to 39.8.8

npm install electron@">=39.8.8"

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-2026-70612?

electron: upgrade to 39.8.8, 40.9.0. Exact commands for each OS are on this page.

Is CVE-2026-70612 being exploited?

CVE-2026-70612 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-2026-70612 affect?

CVE-2026-70612 affects electron. Severity is medium (CVSS 5.4). Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.8, 40.9.0, 41.2.1, and 42.0.0-beta.3, requests to open external protocol URLs from web content did not take iframe sandbox

How urgent is CVE-2026-70612?

Priority 33/100. Remotely exploitable, no login, no user action

Software pages

Electron vulnerabilities

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References

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