Remote code execution in Microsoft Edge (widely used browser) is broadly impactful and newsworthy for enterprises.
CVE-2026-96199
Heap-based buffer overflow in Microsoft Edge enabling remote code execution.
Is CVE-2026-96199 being exploited?
Not confirmed. CVE-2026-96199 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.
How severe is CVE-2026-96199?
CVE-2026-96199 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-2026-96199?
Yes. A fix has been recorded for CVE-2026-96199. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-96199 affect?
CVE-2026-96199 affects Microsoft Edge (Chromium-based) on supported platforms. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-96199?
Apply Edge security updates immediately and restart browsers; monitor for exploit activity.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution via heap overflow in Edge; attacker can run arbitrary code in browser process and compromise user sessions or escalate.
Immediate action required
- affected>= 1.0.0.0 and < 154.0.4258.37
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.