CVE-2026-94642 in Thrift
Summary
by MITRE • 10/02/2026
Uncaught exception vulnerability in Apache Thrift PHP bindings.
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 Apache Thrift software framework provides code generation tools and libraries for cross-language RPC communication, enabling seamless interaction between services written in different programming languages. Within this ecosystem, the PHP bindings serve as a critical interface for developers integrating PHP applications with backend microservices or other systems utilizing Thrift protocols. A significant security flaw was identified within these PHP bindings prior to version 0.25.0, specifically concerning how uncaught exceptions are handled during runtime execution. This vulnerability stems from an inadequate error handling mechanism that fails to properly intercept and manage exception states arising from malformed input data or unexpected protocol violations. When a Thrift client or server processes requests containing invalid structures or corrupted payloads, the underlying PHP engine may encounter conditions where standard control flow is disrupted without being caught by existing try-catch blocks designed for application-level logic errors.
The technical nature of this flaw involves the failure to gracefully handle exceptions that propagate up through the call stack when deserializing complex Thrift messages. In many implementations, if an exception occurs during the parsing or serialization process and is not explicitly handled within the immediate execution context, it results in a fatal error condition rather than a controlled response. This behavior can lead to abrupt termination of the PHP worker processes or scripts that rely on Apache Thrift for communication. From a security perspective, this lack of robust exception handling creates opportunities for denial-of-service attacks where an attacker sends specifically crafted malicious payloads designed to trigger these uncaught exceptions repeatedly. By exhausting server resources through continuous process crashes or memory leaks associated with improper cleanup after failed operations, attackers can degrade the availability of services dependent on Thrift-based communication channels.
Furthermore, this vulnerability intersects with broader categories of software defects defined by industry standards such as CWE-754, which refers to an inappropriate check for a special condition, and CWE-248, describing unhandled exceptions in critical code paths. The absence of proper exception handling violates the principle of fail-safe defaults, where systems should continue operating securely even when encountering unexpected inputs. In the context of the MITRE ATT&CK framework, this vulnerability aligns with techniques related to resource exhaustion under T1496, as well as potential information disclosure if error messages expose stack traces or internal system details to remote attackers before being suppressed by secure logging practices. The impact extends beyond simple availability loss; in some configurations, verbose error reporting enabled during development may leak sensitive architectural insights or library versions that aid further exploitation attempts against the broader application infrastructure.
To mitigate this risk and restore operational integrity, organizations utilizing Apache Thrift with PHP must upgrade to version 0.25.0 or later immediately. This release incorporates fixes for exception handling logic within the bindings, ensuring that errors during message processing are caught and managed appropriately without causing uncontrolled process termination. In addition to upgrading, developers should implement comprehensive error handling strategies in their application code surrounding Thrift client invocations. This includes wrapping service calls in robust try-catch blocks that log detailed internal diagnostics while returning generic, non-revealing messages to clients. Enabling strict mode and configuring PHP to suppress stack trace exposure in production environments further reduces the attack surface by preventing information leakage through error outputs. Regular auditing of third-party library dependencies and maintaining up-to-date versions remain essential practices for sustaining a secure software supply chain against evolving threats targeting communication layers.