Medium [CVE-2026-71407] 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
This medium-severity Fortinet advisory covers CVE-2026-71407 affecting FortiOS.
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Summary
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.
Affected products named by the advisory: FortiProxy.
- FortiOS FortiOS: 7.2 through 8.0 (vendor-listed versions)
Official advisory · high-confidence parse· fetched 24 days ago·verify at source
- FortiOS 7.6: 7.6.7
Official advisory · high-confidence parse· fetched 24 days ago·verify at source
Mitigation checklist
- Upgrade per the Affected/Solution table: FortiOS 7.6: 7.6.7.
Official advisory · high-confidence parse· fetched 24 days ago·verify at source
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