CVE-2026-26449 in Stomper
Summary
by MITRE • 08/26/2026
In Stomper 5e2741e when a client sends a SEND frame missing the destination header field, the server triggers a null pointer dereference (or access to invalid memory) while processing the frame, causing the process to crash.
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Analysis
by VulDB Data Team • 08/26/2026
The vulnerability identified in Stomper version 5e2741e represents a critical input validation failure within the STOMP protocol implementation that leads to application instability and potential denial of service. The Simple Text Oriented Messaging Protocol (STOMp) is widely used for message-oriented middleware, allowing clients to send messages to servers which then route them to subscribers or other destinations. In this specific instance, the flaw occurs during the processing of a SEND frame where the client omits the mandatory destination header field. According to STOMP specifications, every SEND command must include a destination header that specifies where the message should be routed. The server-side implementation fails to perform adequate null checks before attempting to access or utilize this missing data structure.
When a malicious actor sends a crafted SEND frame lacking the required destination header, the application logic proceeds under the false assumption that the field exists and is valid. This oversight results in a null pointer dereference as the code attempts to read from an uninitialized memory address associated with the absent header. In many programming languages such as C or Rust, accessing a null pointer triggers immediate termination of the process due to segmentation faults or panic conditions. Even if the language handles exceptions differently, the result is typically an unhandled exception that crashes the server thread handling the connection. This behavior classifies the vulnerability under CWE-476, which denotes NULL Pointer Dereference, indicating that the software performs a dereference of a pointer that evaluates to null.
The operational impact of this flaw is primarily focused on availability rather than confidentiality or integrity in its immediate manifestation. An attacker can exploit this condition by sending a single malformed packet to any open STOMP endpoint running the vulnerable version. This action causes the server process handling that specific connection to crash, leading to a denial of service for all users connected through that instance. If the application is not configured with robust restart mechanisms or load balancing across multiple instances, this can result in significant downtime and disruption of messaging services. Furthermore, depending on the underlying memory management and operating system protections, such crashes might occasionally leak stack traces containing sensitive internal information to the client, although the primary risk remains service interruption.
From a threat intelligence perspective, this vulnerability aligns with MITRE ATT&CK technique T1499, Endpoint Denial of Service, specifically under sub-techniques involving application exhaustion or resource consumption via malformed input. The attack vector is remote and requires no authentication if the STOMP port is publicly accessible, making it particularly dangerous in internet-facing environments. To mitigate this risk, developers must implement strict input validation at the protocol parsing layer to ensure all mandatory headers are present before processing begins. Additionally, integrating defensive programming practices such as null checks for header fields can prevent dereferencing errors. Deploying a Web Application Firewall or STOMP-specific gateway that validates frame structure prior to reaching the application logic provides an effective defense-in-depth strategy. Updating Stomper to a patched version where these validation gaps are closed is the most direct remediation path available to administrators and developers.