CVE-2026-109714

5.4Medium

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

5.4Medium

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required
Impact: Limited impact
Weakness: CWE-119

Impact

Attackers can potentially compromise application memory to read or modify data if a user visits a malicious page or views a crafted email. The victim must load the malicious content in an affected browser or mail client.

Root cause

Improper boundary handling in the Mozilla Layout component leads to a memory buffer error.

Affected systems

Firefox versions prior to 158 and Thunderbird versions prior to 158.

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

Fix & remediation

Upgrade Firefox and Thunderbird to version 158 or later. No workaround or configuration mitigation is documented.

shell

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

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

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NVD description

Incorrect boundary conditions in the Layout component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

References

Source: nvd.nist.gov/vuln/detail/CVE-2026-109714