CVE-2026-34774
Electron offscreen rendering UAF can crash memory when parent destroyed with child window.
Is CVE-2026-34774 being exploited?
Not confirmed. CVE-2026-34774 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.44% probability of exploitation in the next 30 days.
How severe is CVE-2026-34774?
CVE-2026-34774 is rated High with a CVSS score of 8.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-34774?
Yes. A fix has been recorded for CVE-2026-34774. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-34774 affect?
CVE-2026-34774 affects Electron framework (pre-39.8.1, pre-40.7.0, pre-41.0.0). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-34774?
Upgrade Electron to patched versions (39.8.1+, 40.7.0+, 41.0.0+).
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Crash or memory corruption via use-after-free in offscreen WebContents when parent is closed with a child window.
Patch when possible
- affected< 39.8.1
- affected>= 40.0.0-alpha.1 and < 40.7.0
- affected>= 41.0.0-alpha.1 and < 41.0.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.