CVE-2026-48069 in gRPC
Summary
by MITRE • 07/15/2026
@grpc/grps-js implements the core functionality of gRPC purely in JavaScript, without a C++ addon. Prior to 1.9.16, 1.10.12, 1.11.4, 1.12.7, 1.13.5, and 1.14.4, an invalid incoming compressed message can cause a client or server process that uses @grpc/grpc-js to crash. This issue is fixed in versions 1.9.16, 1.10.12, 1.11.4, 1.12.7, 1.13.5, and 1.14.4.
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Analysis
by VulDB Data Team • 07/15/2026
The vulnerability affects the @grpc/grpc-js library which provides a pure javascript implementation of gRPC functionality without relying on C++ addons for core operations. This JavaScript implementation is widely used in node.js environments where developers need to communicate with gRPC services using native javascript code rather than compiled extensions. The flaw manifests when processing compressed messages received from remote peers, creating a potential denial of service condition that can bring down entire client or server processes.
The technical nature of this vulnerability stems from inadequate input validation within the decompression logic of the gRPC implementation. When an invalid or malformed compressed message is received, the decompression routine fails to properly handle error conditions, leading to uncaught exceptions that terminate the process execution. This represents a classic buffer over-read or improper error handling scenario where the library does not adequately sanitize incoming data before attempting to decompress it, causing a crash in the event of malformed input.
From an operational perspective, this vulnerability creates significant risk for systems relying on gRPC-js for service communication as it can be exploited through crafted malicious messages sent to any endpoint using the vulnerable library version. The impact extends beyond simple availability issues since these crashes can occur in production environments where continuous operation is critical. Attackers could potentially send specially crafted compressed messages to cause repeated process restarts, leading to service disruption and potential data loss.
The fix implemented in versions 1.9.16, 1.10.12, 1.11.4, 1.12.7, 1.13.5, and 1.14.4 addresses this by adding proper validation checks before attempting decompression operations. These updates ensure that malformed compressed messages are handled gracefully through appropriate error handling mechanisms rather than causing process termination. The remediation follows established security practices for input validation and robust error handling as recommended in CWE-20, which covers improper input validation.
Organizations using gRPC-js should prioritize immediate upgrade to patched versions to mitigate this vulnerability. The issue aligns with ATT&CK technique T1499.004 for network denial of service attacks where adversaries can cause system unavailability through malformed message processing. Security teams should also implement monitoring for unusual process termination patterns in systems using this library, particularly when dealing with external gRPC communication where input validation cannot be fully trusted. The vulnerability demonstrates the importance of proper error handling in network protocols and highlights how seemingly minor implementation flaws can lead to significant operational impacts in distributed systems.