CVE-2026-71407 Memory corruption in FortiOS

What is CVE-2026-71407?

CVE-2026-71407 is a medium-severity memory corruption vulnerability in Fortinet Fortios, published on 12 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A Stack-based Buffer Overflow vulnerability [CWE-121] vulnerability in Fortinet FortiOS 7.6.1 through 7.6.6 may allow an unauthenticated attacker who can bypass stack protection and ASLR to execute arbitrary code or commands in the context of the WAD daemon via crafted sockets, only if the explicit proxy is configured with Kerberos authentication and SOCKS enabled.

Weakness: CWE-121

Which versions are affected by CVE-2026-71407?

It affects 1 product.

Products include Fortinet Fortios.

How do I fix CVE-2026-71407?

No fix has been published for CVE-2026-71407 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-71407 being exploited?

There is no known exploitation of CVE-2026-71407 in the wild and no public exploit code.

Other vulnerabilities in Fortinet Fortios

• CVE-2024-23113 Fortinet Multiple Products Format String Exploited Critical 9.8
• CVE-2022-40684 Fortinet Multiple Products Authentication Bypass Exploited Critical 9.8
• CVE-2024-55591 Fortinet FortiOS and FortiProxy Authentication Bypass Exploited Critical 9.6
• CVE-2024-21762 Fortinet FortiOS Out-of-Bound Write Exploited Critical 9.6
• CVE-2022-42475 Fortinet FortiOS Heap-Based Buffer Overflow Exploited Critical 9.3

All Fortinet Fortios vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-32v4-7g7v-4c6p.