CVE-2026-8362: WOSDefaultHttpModule Buffer Overflow Flaw

CVE-2026-8362 Overview

CVE-2026-8362 is a stack-based buffer overflow [CWE-121] in WOSDefaultHttpModule.dll. The vulnerability triggers when the module processes a long URL path that starts with /woshome. A remote, unauthenticated attacker can send a crafted HTTP request to overflow a stack buffer and corrupt control data. Successful exploitation can lead to arbitrary code execution in the context of the affected service.

Critical Impact
Network-reachable, unauthenticated attackers can achieve remote code execution by sending a single oversized HTTP URL beginning with /woshome, compromising confidentiality, integrity, and availability of the host.

Affected Products

Software embedding WOSDefaultHttpModule.dll
Refer to the Tenable Security Research Advisory for the vendor and version list
No CPE entries have been published in NVD at the time of writing

Discovery Timeline

2026-05-27 - CVE-2026-8362 published to NVD
2026-05-27 - Last updated in NVD database

Technical Details for CVE-2026-8362

Vulnerability Analysis

The defect resides in the HTTP request handling logic of WOSDefaultHttpModule.dll. When the module parses a request whose URL path begins with /woshome, it copies the path into a fixed-size stack buffer without enforcing a length check. Supplying a path longer than the buffer overwrites adjacent stack memory, including saved return addresses and structured exception handler (SEH) records on Windows. Because the request is processed before authentication, an attacker can reach the vulnerable code path with only network access to the listening HTTP endpoint. Successful exploitation typically yields code execution in the worker process hosting the module, providing a foothold for lateral movement.

Root Cause

The root cause is missing bounds validation on attacker-controlled URL path data before it is written into a stack-allocated buffer. This pattern is classified under [CWE-121] Stack-based Buffer Overflow. The handler trusts the request line length supplied by the client, which violates the principle of validating input length at the trust boundary.

Attack Vector

The attack vector is network-based and requires no privileges or user interaction. An attacker sends an HTTP request of the form GET /woshome<long-string> HTTP/1.1 to a server hosting the vulnerable module. The oversized path traverses the parser into the unsafe copy routine and corrupts the stack frame. See the Tenable Security Research Advisory for additional technical detail.

No verified proof-of-concept code is publicly available.
Refer to the Tenable advisory linked above for technical reproduction details.

Detection Methods for CVE-2026-8362

Indicators of Compromise

HTTP requests with URL paths beginning with /woshome followed by abnormally long strings (typically several hundred bytes or more)
Unexpected crashes, restarts, or access violations logged by the process hosting WOSDefaultHttpModule.dll
Worker process spawning unusual child processes such as cmd.exe, powershell.exe, or rundll32.exe shortly after receiving HTTP traffic

Detection Strategies

Inspect web server and reverse proxy access logs for requests to /woshome paths exceeding a sane length threshold (for example, 512 bytes)
Deploy IDS or WAF signatures that match long URL paths prefixed with /woshome and inspect for non-printable or shellcode-like byte patterns
Correlate HTTP request anomalies with process crash events and EDR telemetry on hosts running the affected module

Monitoring Recommendations

Forward web server logs and Windows Application/System event logs to a centralized SIEM for cross-source correlation
Alert on repeated 5xx responses or service restarts from endpoints exposing the /woshome URL prefix
Monitor for outbound connections initiated by the affected worker process to untrusted destinations after suspicious requests

How to Mitigate CVE-2026-8362

Immediate Actions Required

Identify all internal and internet-facing hosts running software that loads WOSDefaultHttpModule.dll and inventory exposed HTTP endpoints
Restrict network access to affected services using firewall rules or reverse proxy allow-lists until a vendor patch is applied
Deploy WAF rules blocking requests where the URL path begins with /woshome and exceeds a conservative length limit

Patch Information

Consult the Tenable Security Research Advisory for the affected vendor's official patch details. Apply the vendor-supplied update to WOSDefaultHttpModule.dll as soon as it becomes available. No CPE or fixed-version data is currently published in NVD.

Workarounds

Block or filter HTTP requests with URL paths starting with /woshome at the perimeter if the endpoint is not required
Enforce a maximum URL length at the reverse proxy or WAF, such as 2048 bytes, to truncate or reject malformed requests
Run the hosting service under a least-privilege account to reduce the impact of successful code execution

bash

# Example NGINX reverse proxy rule to block oversized /woshome paths
location /woshome {
    if ($request_uri ~* "^/woshome.{512,}") {
        return 400;
    }
    proxy_pass http://backend;
}