CVE-2026-109765

4.2Medium

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

4.2Medium

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: Required
Impact: Limited impact
Weakness: CWE-362, CWE-416

Impact

Remote attackers can potentially achieve partial information disclosure and integrity compromise if they convince a user to interact with malicious content. Exploitation depends on winning a race condition in text rendering.

Root cause

A race condition leading to a use-after-free exists in the Graphics: Text component.

Affected systems

Firefox prior to 158, Firefox ESR prior to 153.5, Thunderbird prior to 158, and Thunderbird ESR prior to 153.5

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

Fix & remediation

Upgrade to Firefox 158, Firefox ESR 153.5, Thunderbird 158, or Thunderbird 153.5 or later. No interim mitigations are provided in the advisory, so updating is required.

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

Race condition, use-after-free in the Graphics: Text 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-2026-109765