What is CVE-2026-120572?

CVE-2026-120572 is a high-severity vulnerability, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2026-11-03.

How severe is CVE-2026-120572?

High severity. CVSS v3 base score is 8.8 out of 10.

CVE-2026-120572

CVE-2026-120572

Incorrect boundary conditions in the Layout: Block and Inline component. This vulnerability was fixed in Firefox 159.0.1.

Vulnerability class: Buffer Overflow

Published 2026-11-03 · last modified 2026-11-03.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

bugzilla.mozilla.org/show_bug.cgi
www.mozilla.org/security/advisories/mfsa2026-123/

Frequently asked questions

What is CVE-2026-120572?: CVE-2026-120572 is a high-severity vulnerability, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2026-11-03.
How severe is CVE-2026-120572?: High severity. CVSS v3 base score is 8.8 out of 10.