CVE-2026-93926 in Thrift
Summary
by MITRE • 10/02/2026
Missing release of memory after effective lifetime, Missing release of resource after effective lifetime vulnerability in Apache Thrift THeaderTransport.
This issue affects Apache Thrift: before 0.25.0.
Users are recommended to upgrade to version 0.25.0, which fixes the issue.
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Analysis
by VulDB Data Team • 10/02/2026
The vulnerability identified as a missing release of memory or resource after effective lifetime within the Apache Thrift THeaderTransport component represents a classic resource management flaw that can lead to significant operational instability and potential security degradation. This specific defect occurs when the application allocates resources, such as heap-allocated buffers or file descriptors, during the processing of network traffic but fails to properly deallocate them once they are no longer required by the transport layer logic. In high-throughput environments typical of microservices architectures that rely on Apache Thrift for remote procedure calls, this oversight results in a gradual accumulation of unreleased memory allocations over time. The THeaderTransport class is responsible for handling header information and framing data during serialization and deserialization processes; if it does not correctly invoke cleanup routines upon completion or error conditions, the operating system's memory manager retains these blocks as occupied even though they are inaccessible to the application logic.
From a technical perspective, this flaw aligns with CWE-401, which describes missing release of memory after effective lifetime, and often overlaps with CWE-772 regarding missing release of resource after effective lifetime. The root cause typically lies in code paths where exceptions occur or early returns are executed without triggering the corresponding destructor calls or explicit free operations for allocated buffers. In C++ based implementations like those found in Apache Thrift, this might manifest as a failure to call delete on dynamically allocated arrays or pointers that were created during header parsing. Because network services often handle concurrent connections from multiple clients, each request can trigger additional allocations. If the cleanup logic is bypassed due to logical errors in state management or error handling routines, the memory footprint of the service process will expand monotonically until system resources are exhausted.
The operational impact of this vulnerability is primarily characterized by resource exhaustion leading to denial of service conditions. As the server continues to accept and process requests without releasing associated memory, it eventually consumes all available RAM on the host machine. This triggers the operating system's out-of-memory killer or causes the application itself to crash due to allocation failures. In a distributed system context, this can lead to cascading failures where dependent services experience timeouts or connection resets because the Thrift server becomes unresponsive. While direct remote code execution is not inherently implied by memory leaks alone, the instability created can be leveraged in conjunction with other vulnerabilities for more severe attacks. Furthermore, excessive memory usage increases latency due to increased garbage collection pressure if managed languages are involved, or simply causes swapping to disk which drastically degrades performance metrics critical for real-time data processing systems.
Mitigation strategies focus on ensuring robust resource lifecycle management within the application codebase and upgrading affected software components immediately. The primary remediation is to upgrade Apache Thrift to version 0.25.0 or later, where developers have addressed these specific cleanup routines in the THeaderTransport implementation. For organizations unable to patch immediately due to compatibility constraints, implementing strict monitoring of memory consumption trends can help detect anomalous growth indicative of this leak before it causes a crash. Additionally, code reviews should prioritize verifying that every allocation path has a corresponding deallocation path, particularly within exception handling blocks and loop iterations involving network I/O operations. Adopting static analysis tools configured to detect CWE-401 patterns during the development phase can prevent similar issues from being introduced in future updates or custom extensions of the Thrift framework.