CVE-2026-3847

8.8 highEPSS 0.3%

High (8.8) in mozilla firefox. EPSS 0.3% chance of exploitation in the next 30 days.

Memory safety bugs present in Firefox 148.0.2. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 148.0.2.

Severity

CVSS 3.1

8.8 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 25% of CVEs (scores of 2026-10-31)
CWEs: CWE-119, CWE-416
Published: 2026-03-10
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

mozilla:firefox

References

https://bugzilla.mozilla.org/buglist.cgi?bug_id=2017513%2C2017622%2C2019341
https://www.mozilla.org/security/advisories/mfsa2026-19/

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