External risk intelligence

WOSDefaultHttpModule.dll Stack Buffer Overflow

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-8362

The vulnerability exists within an HTTP module processing URL paths. Components handling HTTP requests at the application or web server layer are commonly exposed to the internet to provide web services, making them a likely target for remote, internet-based access in standard deployments.

Buffer Overflow

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability has been identified in a component related to handling web requests, specifically concerning overly long URL paths. This issue could potentially allow unauthorized access and manipulation of systems if exploited.

Component flaw allows long web paths.
Matters because it is network-accessible.
Confirm relevance and assess potential exposure.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending a specially crafted, long URL to a web server that uses the affected component. This could potentially lead to a critical impact, allowing an attacker to execute arbitrary code.

Attacker sends a long URL over the network.
Vulnerable HTTP module processes the URL path.
Remote code execution and system compromise.

Live Threat

Current exploitation, exposure, and threat context

A stack-based buffer overflow in WOSDefaultHttpModule.dll could allow an attacker to cause a denial of service or potentially execute arbitrary code when processing a long URL path starting with /woshome. This condition could be exploited by an unauthenticated remote attacker by sending a specially crafted URL.

Service availability could be impacted.
Long URLs could trigger overflow.
Denial of service or code execution.

Operational Fix

Recommended remediation, mitigation, and detection steps

Addressing this critical vulnerability will likely involve collaboration between application owners, who understand the specific use of the WOSDefaultHttpModule.dll, and infrastructure or platform teams responsible for the web server environment. The immediate practical first step is to identify all instances of the affected technology, determine their external reachability and business criticality, and then confirm the accountable owner for each instance to prioritize remediation efforts.

Application owners should own the remediation.
Verify external reachability and business criticality.
Plan coordinated maintenance for fixes.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is WOSDefaultHttpModule.dll?

This component acts as a specialized handler within a web server environment, designed to process incoming HTTP requests. It is typically integrated into the web infrastructure to manage URL routing and traffic flow. Because it intercepts and interprets web traffic, it plays a foundational role in how the underlying application communicates with users and external services.

What does CVE-2026-8362 mean in plain English?

This vulnerability is a stack-based buffer overflow, classified as CWE-121. It occurs when the software receives more data than it is designed to hold in a specific memory area called the stack. By sending an excessively long URL, an attacker can overwrite adjacent memory, which may cause the application to crash or behave unexpectedly, potentially allowing the attacker to run their own unauthorized instructions.

How is this vulnerability triggered?

An attacker triggers this flaw by sending a specifically crafted, long URL path that begins with the string /woshome to the affected web server. The vulnerability is only activated when the module attempts to process these malformed inputs. Standard, correctly formatted requests or paths that do not start with /woshome do not engage the vulnerable logic in the module.

How do I know if I am at risk?

According to Halo Surface Signal, this vulnerability resides in a component that handles web requests, which are frequently exposed to the internet to provide services. If your system runs this component and is accessible from the internet, it is at a higher risk of being targeted by remote attackers. You should assess whether your instances of this technology are reachable from outside your internal network.

What should I do first to manage this risk?

Your first step is to perform an inventory to locate every instance of the technology using this DLL within your environment. Once identified, evaluate the business importance of each system and confirm which teams are responsible for their maintenance. Documenting these owners is essential for coordinating the necessary updates or security configurations once a formal resolution is available.

References

www.tenable.com/security/research/TRA-2026-45

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.