CVE-2026-3845
Heap buffer overflow in Firefox for Android AV playback (<148.0.2).
Is CVE-2026-3845 being exploited?
Not confirmed. CVE-2026-3845 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-2026-3845?
CVE-2026-3845 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-2026-3845?
Yes. A fix has been recorded for CVE-2026-3845. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-3845 affect?
CVE-2026-3845 affects Firefox for Android, Mozilla Firefox on Android < 148.0.2. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-3845?
Update to Firefox 148.0.2 or newer on Android.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution or device compromise via AV playback heap overflow on Android Firefox (<148.0.2).
Immediate action required