Affects widely-used Chrome on Windows; remote code execution via WebRTC buffer overflow.
CVE-2026-12466
Heap buffer overflow in Chrome WebRTC on Windows enables RCE via crafted HTML.
Is CVE-2026-12466 being exploited?
Not confirmed. CVE-2026-12466 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 0.43% probability of exploitation in the next 30 days.
How severe is CVE-2026-12466?
CVE-2026-12466 is rated High with a CVSS score of 8.8. 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-2026-12466?
Yes. A fix has been recorded for CVE-2026-12466. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-12466 affect?
CVE-2026-12466 affects Google Chrome on Windows. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-12466?
Update to Chrome 149.0.7827.155 or newer.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
RCE on Windows via crafted HTML page exploiting WebRTC heap overflow in Chrome.
Immediate action required
- affected< 149.0.7827.155
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.