CVE-2026-120572: Incorrect Boundary Conditions
Source GCVE Database
Not known to be exploited · CVSS 8.8 High · fixed in 159.0.1 : patch Firefox soon.
Data as of 3 Nov 2026, 16:43 UTC
Thin evidence
One scorer or none| CISA-ADP | CVSS 3.1 | 8.8 |
|---|
- Patch
- Available – fixed in 159.0.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 3 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 3 Nov 2026.
What to do
AI-suggested
Users and administrators should update Firefox to version 159.0.1 or later to remediate this vulnerability. The vendor advisory confirms that the issue is fixed in this release. No additional mitigation actions are indicated.
Description
CVE-2026-120572 is a high-severity vulnerability involving incorrect boundary conditions in the Layout: Block and Inline component of Firefox. This flaw could impact confidentiality, integrity, and availability. The issue was fixed in Firefox version 159.0.1.