5.3

CVE-2026-34776: electron Out-of-bounds Read

CVSS: 5.3v3.1MediumAnalyzed
AliasesGHSA-3c8v-cfp5-9885
Published 03-04-2026Last modified 06-04-2026
Open JSON

Vulnerability summary

CVE-2026-34776 is a medium (CVSS 5.3) Out-of-bounds Read vulnerability in electron. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 13.2% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.23%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 03-04-2026
    PublishedVulnerability first disclosed.
  2. 06-04-2026
    Last modifiedVulnerability information updated.

Description

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 macOS and Linux, apps that call app.requestSingleInstanceLock() were vulnerable to an out-of-bounds heap read when parsing a crafted second-instance message. Leaked memory could be delivered to the app's second-instance event handler. This issue is limited to processes running as the same user as the Electron app. Apps that do not call app.requestSingleInstanceLock() are not affected. Windows is not affected by this issue. This issue has been patched in versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.23%

Chance of exploitation in the next 30 days

Percentile

13%

Versus all other CVEs

30-day change

+0.01 pp

From 0.22% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.23%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Electron1 product
  • electron< 38.8.6 | ≥ 39.0.0-alpha.1, < 39.8.1 | ≥ 40.0.0-alpha.1, < 40.8.1 | ≥ 41.0.0-alpha.1, < 41.0.0
Electronjs1 product
  • electronEOL< 38.8.6 | ≥ 39.0.0, < 39.8.1 | ≥ 40.0.0, < 40.8.1 | 41.0.0:alpha1 | 41.0.0:alpha2 | 41.0.0:alpha3 | 41.0.0:alpha4 | 41.0.0:alpha5 | 41.0.0:alpha6 | 41.0.0:beta1 | 41.0.0:beta2 | 41.0.0:beta3 | 41.0.0:beta4 | 41.0.0:beta5 | 41.0.0:beta6 | 41.0.0:beta7 | 41.0.0:beta8
Npm1 product
  • electron< 38.8.6 | ≥ 39.0.0-alpha.1, < 39.8.1 | ≥ 40.0.0-alpha.1, < 40.8.1 | ≥ 41.0.0-alpha.1, < 41.0.0

3 vendors · 3 products

References

3 links