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Fortinet PSIRT AdvisoriesFG-IR-26-156

Heap overflow in kernel driver due to missing size validation

CVSSv3 Score: 7.3 A buffer copy without checking size of input vulnerability [CWE-120] in FortiClient Windows may allow an unauthenticated attacker in a position to alter or craft DNS responses to the targeted host to execute arbitrary code via malicious packets. Revised on 2026-08-12 00:00:00

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7.3CVSS out of 10High severity
Scope

What the vendor says is affected

  • FortiClient
Timeline

When this advisory changed

  1. Published by Fortinet

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

  3. Confirmed at the source

    Our collector saw this advisory during a later source check.

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