CVE-2026-109754

8.1High

Published 13 Oct 2026 · NVD status: Deferred · AI triage by gemini-3.8-flash

8.1High

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required
Impact: High impact on confidentiality, integrity
Weakness: CWE-119

Impact

Remote attackers can compromise confidentiality and integrity on client machines, potentially executing arbitrary code. They need a user to open a malicious link or message in an affected browser or mail client.

Root cause

Improper boundary checks in the DOM: Editor component cause memory corruption.

Affected systems

Firefox before 158, Firefox ESR before 153.5, Thunderbird before 158, and Thunderbird ESR before 153.5.

CVSS v3.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Fix & remediation

Upgrade to Firefox 158, Firefox ESR 153.5, Thunderbird 158, or Thunderbird 153.5. No interim workarounds or mitigations are provided, so you must update the applications.

shell

$ sudo apt-get update && sudo apt-get --only-upgrade install firefox thunderbird

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

Ad · In-content banner

NVD description

Incorrect boundary conditions in the DOM: Editor component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

References

Source: nvd.nist.gov/vuln/detail/CVE-2026-109754