FORTIOS · CVE-2026-126256 · Infrastructure
FIX → 8.0.2 · 7.6.8 · 7.4.13 · 7.2.14 ✓ verified
Fortinet's advisory FG-IR-26-270 describes an out-of-bounds read/write (CWE-125/CWE-787) in the FortiOS kernel, also affecting FortiSASE. Crafted packets may let a remote attacker execute code or commands. Fortinet rates it High (CVSS 7.4), says it was found internally, and lists it as not known to be exploited. Fixed in FortiOS 8.0.2, 7.6.8, 7.4.13 and 7.2.14.
first public Nov 11, 2026 · 2 sources
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Teams running FortiGate firewalls on FortiOS 8.0.0-8.0.1, 7.6.0-7.6.7, 7.4.0-7.4.12 or 7.2.0-7.2.13, and FortiSASE customers on older branches. Fortinet classes the attack as unauthenticated over crafted packets, although the description says 'privileged'. Anyone on a fixed version can skip it.
Not affected if unknown
Who cares firewall, fortinet, fortios, fortisase, kernel
get system status on each FortiGate and compare to the affected ranges: , , , A out-of-bounds read vulnerability in Fortinet FortiOS 8.0.0 through 8.0.1, FortiOS 7.6.0 through 7.6.7, FortiOS 7.4 all versions, FortiOS 7.2 all versions, FortiOS 7.0 all versions may allow a remote privileged attacker to execute arbitrary code or command via crafted paquets.
This page as .md · .json · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
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8.0.0-8.0.17.6.0-7.6.77.4.0-7.4.127.2.0-7.2.1326.3.2 with no customer action; older FortiSASE branches should migrate to a fixed releaseUpgrade to 8.0.2 · 7.6.8 · 7.4.13 · 7.2.14
8.0.2, 7.6.8, 7.4.13 or 7.2.14 or later; use Fortinet's upgrade path tool https://docs.fortinet.com/upgrade-tool