CVE-2026-10710

Executive Summary

CVE-2026-10710 is a stack-based buffer overflow vulnerability (CWE-121) residing within the fbxsdk::ExtractDrive function of the Autodesk FBX SDK. A maliciously crafted FBX file can trigger this flaw when parsed, potentially allowing an attacker to achieve arbitrary code execution in the context of the current process. The attack vector is local, requires user interaction (opening a crafted file), and carries a CVSS v3.1 base score of 7.8 (High). Any application or pipeline that utilizes the Autodesk FBX SDK to import 3D model files—including game engines, DCC tools (e.g., Maya, 3ds Max), and in-house converters—is exposed. As of this report, no official patch has been released, and vendor confirmation of the vulnerability remains pending.

Technical Analysis

The vulnerability is a classic stack-based buffer overflow (CWE-121) triggered during the parsing of the FBX (Filmbox) file format. The flaw exists within the fbxsdk::ExtractDrive function, a component responsible for extracting and processing file path/directory information from FBX ASCII or binary data. During the extraction process, the function copies attacker-controlled path data into a fixed-length buffer allocated on the call stack without adequate bounds checking.

Mechanism: In the FBX file format, embedded or referenced file paths (e.g., texture paths, external reference links) are stored as character strings. When ExtractDrive processes these strings, it attempts to isolate the drive letter and colon (e.g., C:) from the path. If the input string contains an extremely long sequence of characters prior to the drive separator, or if the drive format is unconventional (e.g., multiple colons, long device path prefixes), the function may copy the excess data into a stack buffer that is not large enough, overflowing adjacent memory on the stack.

Attack Surface: The attack surface is the file-parsing boundary of any software embedding the Autodesk FBX SDK. Since the FBX format supports both binary and ASCII encoded structures, the attacker has flexibility in crafting a malicious file. The parsing occurs at import time, meaning the user must be convinced to open the file in an affected application. This can be achieved through phishing campaigns (email attachment), malicious content on 3D asset repositories, or bundled within legitimate-looking project files.

Code-Level Consideration: While the exact source code is proprietary, the vulnerability class implies a memcpy, strcpy, or sprintf-style operation without a corresponding length check, or a corrupted length field within the FBX node structure controlling the copy size. The lack of a check against the destination buffer's capacity on the stack is the root cause. The CVSS vector (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) confirms that while the attack is local and requires interaction, the exploit chain is straightforward (Low complexity) and requires no privileges.

Exploitation Scenarios

This vulnerability allows for arbitrary code execution upon successful exploitation. The attack chain proceeds as follows:

1) Reconnaissance/Weaponization: The attacker identifies organizations or individuals using software that relies on the Autodesk FBX SDK—targeting game development studios, VFX houses, or engineering firms with 3D data pipelines. The attacker meticulously crafts a malicious FBX file designed to trigger the overflow in fbxsdk::ExtractDrive. This typically involves placing a malformed, oversized ExternalFileReference or RelativeFilename property within an FBX node.

2) Specific Trigger/Weaponization Steps:

• Crafting the FBX: Using an FBX binary or ASCII writer, the attacker creates a valid FBX file structure.
• Payload Placement: Inside a specific data node (e.g., "Texture", "Video"), the attacker inserts a string into the FileName or RelativeFilename field that begins with a long sequence of non-colon characters (e.g., "AAAA...A" ) followed by a colon. The length of this string is calibrated to exceed the allocated stack buffer in ExtractDrive.
• ROP Chain / Shellcode: Since the overflow is stack-based, the attacker can overwrite the saved return address or SEH handler. To bypass ASLR and DEP, the attacker pre-pends a ROP chain (Return-Oriented Programming) within the oversized string itself. The final jump is set to a VirtualProtect or similar API to make the attacker-controlled heap portion executable, or directly to a heap-sprayed shellcode region.
• File Distribution: The weaponized FBX file is then distributed via a phishing email with a compelling subject (e.g., "Approved asset pack for Q3"), or uploaded to a shared project folder that the target is likely to sync from.

3) Payload/Execution: Once the target opens the FBX file within an affected application (e.g., imported into a game engine like Unreal Engine, or a DCC tool like Maya), the parser processes the malicious node. fbxsdk::ExtractDrive copies the oversized string, triggers the overflow, and the overwritten return address redirects execution to the attacker's ROP chain, eventually executing the shellcode. The shellcode typically downloads and executes a second-stage payload (e.g., Cobalt Strike beacon, ransomware binary) or executes included malicious code.

4) Post-Exploitation Impact: With code execution in the context of the current process (the user-level application), the attacker gains the user's privileges. This allows for data exfiltration from the local machine (stealing source code, unreleased assets, internal documents), credential harvesting from memory/browsers, and pivoting to internal network resources if the machine is domain-joined.

(Note: This flaw is not remotely exploitable without user interaction, but phishing and supply-chain asset poisoning are highly effective delivery methods for this class of vulnerability.)

Impact Assessment

CVSS Sub-scores Analysis: The vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H indicates:

• Attack Vector (L): Local—the attacker must operate on the local system to deliver and execute the file.
• Attack Complexity (L): Low—the conditions for exploitation are predictable, and no race conditions or specialized environments are needed.
• Privileges Required (N): None—the attack requires no prior authentication or access.
• User Interaction (R): Required—the victim must open the crafted file.
• Confidentiality, Integrity, Availability (H/H/H): A successful exploit yields complete control over the affected process, leading to total compromise of data confidentiality (read anything the user can access), integrity (modify or delete files), and availability (crash or hang the system).

Business Impact:

• Intellectual Property Theft: In media and entertainment, loss of unreleased assets, proprietary shaders, or motion capture data is catastrophic.
• Pivoting & Lateral Movement: The compromised workstation can serve as a foothold to attack internal development servers, code repositories (e.g., GitLab), and CI/CD pipelines.
• Data Corruption: Because the SDK is used in automated pipelines, a single malicious file could corrupt a rendering farm or automated build process.
• Supply Chain Risk: If an asset vendor or middleware provider distributes malicious FBX files, multiple downstream organizations are affected.

Affected Systems: Any software using the vulnerable version of Autodesk FBX SDK, potentially including Autodesk Maya, 3ds Max, Revit (via FBX exchange), game engines (Unreal, Unity via plugins), and custom in-house tools. Exact affected version ranges are still unknown, but legacy SDK versions are likely vulnerable.

Blast Radius: Given the popularity of the FBX format as an interchange standard in the 3D industry, this vulnerability has a wide blast radius across a multi-billion dollar industry.

Detection Guidance

Detection of this vulnerability focuses on identifying both the malicious file in transit and the anomalous behavior on the endpoint.

Sigma Rule

title: Potential FBX SDK Stack Buffer Overflow Activity (CVE-2026-10710)
id: f9a3c1e2-4f23-4b2a-9c3e-2d0f1a5b6c7d
status: experimental
description: Detects processes that load the FBX SDK creating anomalous memory allocations or crashing due to a stack-based buffer overflow.
logsource:
    category: process_creation
    product: windows
detection:
    selection_command:
        Image|endswith:
            - '\maya.exe'
            - '\3dsmax.exe'
            - '\fbxsdk.dll'
    selection_crash:
        EventID: 1000
        Description|contains: 'fbxsdk'
    condition: selection_command and selection_crash
level: high
falsepositives:
    - Legitimate application crashes due to malformed files generated by faulty exporters.
fields:
    - CommandLine
    - Image
tags:
    - attack.t1204
    - attack.execution

YARA Rule

rule CVE_2026_10710_FBX_ExtractDrive_Overflow
{
    meta:
        author = "Valters IT Security"
        description = "Detects malicious FBX files crafted to exploit stack buffer overflow in fbxsdk::ExtractDrive"
        cve = "CVE-2026-10710"
        date = "2026-10-14"
    strings:
        $fx_header_binary = { 4B 61 79 64 61 72 61 20 46 42 58 20 }
        $fx_ascii_header = "FBXHeaderExtension" nocase
        $path_field = "RelativeFilename" nocase
        $long_path = /[A-Za-z0-9]{4096,}:/       // 4KB+ string before a colon
    condition:
        (uint32(0) == 0x4B415944 or $fx_ascii_header) and $path_field and $long_path
}

Suricata IDS Rule

alert http any any -> any any (msg:"CVE-2026-10710 - Malicious FBX File Download Potential Buffer Overflow"; flow:established,to_client; file.data; content:"FDATA_START"; content:"RelativeFilename"; nocase; content:"!"; distance:0; within:4096; content:":|"; distance:0; within:8192; classtype:attempted-user; sid:2026107101; rev:1;)

Note: This rule targets HTTP-based delivery of malicious FBX files. For SMB/email, adjust the protocol accordingly.

Elastic Detection

sequence by process.entity_id with maxspan=5m
  [process where event.action == "start" and process.name in ("maya.exe", "3dsmax.exe")]
  [file where event.action == "open" and file.extension == "fbx"]
  [any where event.code == "1" and message like "*fbxsdk*" and message like "*0xc0000409*"]
  [process where event.action == "end" and process.name in ("maya.exe", "3dsmax.exe") and process.exit_code == 3221225477]

Splunk SPL Query

index=windows sourcetype=WinEventLog:Application
| where EventCode=1000
| rename Message as error_message
| search error_message = "*fbxsdk*" AND (error_message = "*0xc0000409*" OR error_message = "*stack overflow*")
| stats count by host, Image, error_message
| sort - count

Alternatively, for file inspection:

index=main sourcetype=fs_watch
| where file_extension="fbx"
| rex field=raw "(?<path_string>(?:\w{10,}){300,}:)" 
| where isnotnull(path_string) 
| table host, file_name, path_string

Wazuh OSSEC Rule

<group name="fbxsdk,">
    <rule id="100210" level="12">
        <if_sid>100200</if_sid>
        <field name="win.event.system.eventID">^1000$</field>
        <description>CVE-2026-10710: FBX SDK crash detected - potential stack buffer overflow exploitation.</description>
        <group>attack.t1204,</group>
    </rule>
</group>

*Note: This rule assumes a parent rule baselining on process name/log source.

Mitigation & Patch Guidance

Patch Confidence: 0/4 — UNPATCHED. No evidence of a vendor fix or an official patch from Autodesk has been identified from any tracked source.

1) Immediate Mitigations (Compensating Controls):

• File Scanning: Scan all incoming FBX files with security software that includes YARA rules (including the one above) to detect anomalous path lengths before they are opened.
• Sandboxing: Enforce that any application parsing FBX files runs inside a tightly controlled sandbox or virtualized environment with minimal host access and no internet connectivity.
• Least Privilege: Run 3D applications using a non-admin, stripped-down user account to limit the blast radius of a successful exploit.
• User Awareness: Implement a strict security awareness campaign warning users against opening unsolicited .fbx files.

2) Patch/Upgrade Steps:

• Monitor Vendor Advisories: Autodesk (Autodesk Security Advisory). Constantly monitor the vendor's security portal and the NVD entry for this CVE. Since it is an SDK-level issue, the fix will likely come as a new SDK release.
• Update SDK Dependencies: Once available, update the Autodesk FBX SDK to the patched version and recompile all custom tools and applications that statically link the library. Maintain a manifest of software that dynamically links to fbxsdk.dll to ensure the updated DLL is swapped out.
• Disable Features: If a configuration setting allows you to disable external file reference loading or path extraction within the FBX parser, disable it until a fix is applied.

3) Long-Term Hardening:

• Adopt Safer Formats: Transition asset pipelines to alternative formats that have active security support, such as glTF, for interchange where feasible.
• Input Validation: For in-house tools, implement strict input validation and size checks for all path strings parsed from FBX files before they reach the SDK.
• Memory Protection: Ensure all systems running FBX parsing have ASLR, DEP (NX), and CFG (Control Flow Guard) enabled. Modern mitigations increase the exploit complexity significantly.

References

1. NVD Entry: https://nvd.nist.gov/vuln/detail/CVE-2026-10710
2. Autodesk Security Advisory Portal: https://www.autodesk.com/trust/security-advisories
3. CWE-121 (Stack-based Buffer Overflow): https://cwe.mitre.org/data/definitions/121.html
4. MITRE ATT&CK Technique T1204 (User Execution): https://attack.mitre.org/techniques/T1204/
5. CISA Known Exploited Vulnerabilities Catalog (No current listing): https://www.cisa.gov/known-exploited-vulnerabilities-catalog

Threat Actor Campaigns: As of this report, there is no known exploitation in the wild, no CISA KEV entry, and no confirmed threat actor campaigns. The vulnerability is considered high-risk due to its trivial attack vector (malicious file) and the widespread use of the affected SDK across the 3D asset pipeline.