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VulnerabilityPublished

CVE-2026-124870: Incorrect Boundary Conditions

Source GCVE Database

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Authoritative record:CVE-2026-124870· High 8.8

Not known to be exploited · CVSS 8.8 High.

Data as of 10 Nov 2026, 17:32 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
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 10 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 10 Nov 2026.

What to do

AI-suggested

Users and administrators should update Firefox to version 160 or later, or Firefox ESR 153.7 or later, where this vulnerability has been fixed. Applying these official patches fully mitigates the risk from this vulnerability.

Description

CVE-2026-124870 is a high-severity vulnerability involving incorrect boundary conditions in the JavaScript garbage collection (GC) component of Firefox. This flaw was addressed and fixed in Firefox 160 and Firefox ESR 153.7. The vulnerability could potentially lead to severe impacts including confidentiality, integrity, and availability compromises.

References

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