CVE-2026-34773: Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS

Q: How do I fix CVE-2026-34773?

electron: upgrade to 38.8.6, 39.8.1, 40.8.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-34773 being exploited?

CVE-2026-34773 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-2026-34773 affect?

CVE-2026-34773 affects electron. Severity is medium (CVSS 4.7). Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0, on Windows, app.setAsDefaultProtocolClient(protocol) did not validate the protocol

Q: How urgent is CVE-2026-34773?

Priority 20/100. No elevated risk signals yet.

Routine

MEDIUM 4.7UPGRADE

CVE-2026-34773 is a medium-severity flaw (CVSS 4.7) 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 versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0, on Windows, app.setAsDefaultProtocolClient(protocol) did not validate the protocol name before writing to the registry. Apps that pass untrusted input as the protocol name may allow an attacker to write to arbitrary subkeys under HKCU\Software\Classes\, potentially hijacking existing protoco

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.7 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-20, CWE-74
Published	2026-04-04
Last modified	2026-07-24

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

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-04 00:16 UTCPublished CVE record published
2026-07-24 22:10 UTCUpdated Record last modified

electronjs electron UPGRADE

Affected: < 38.8.6 · >= 39.0.0 and < 39.8.1 · >= 40.0.0 and < 40.8.1 · 41.0.0 alpha1 · 41.0.0 alpha2 · 41.0.0 alpha3 · 41.0.0 alpha4 · 41.0.0 alpha5

Fixed in: 38.8.6, 39.8.1, 40.8.1

Safe to downgrade to: a release before 39.0.0

1. Check installed version

npm ls electron

2. UPGRADE to 38.8.6

npm install electron@">=38.8.6"

3. If no update is available yet, DOWNGRADE to a release before 39.0.0

npm view electron versions npm install electron@"<39.0.0"

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-2026-34773?

electron: upgrade to 38.8.6, 39.8.1, 40.8.1. Exact commands for each OS are on this page.

Is CVE-2026-34773 being exploited?

CVE-2026-34773 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-2026-34773 affect?

CVE-2026-34773 affects electron. Severity is medium (CVSS 4.7). Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0, on Windows, app.setAsDefaultProtocolClient(protocol) did not validate the protocol

How urgent is CVE-2026-34773?

Priority 20/100. No elevated risk signals yet.

Software pages

Windows vulnerabilities · Electron vulnerabilities

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References

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