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VulnerabilityPublished

CVE-2026-120572: Incorrect Boundary Conditions

Source GCVE Database

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Authoritative record:CVE-2026-120572· High 8.8

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

CVSS 3.1 base score
8.8High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CISA-ADPCVSS 3.18.8
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:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 3 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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.

References

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