CVE-2025-32030 in federation
Summary
by MITRE • 04/08/2025
Apollo Gateway provides utilities for combining multiple GraphQL microservices into a single GraphQL endpoint. Prior to 2.10.1, a vulnerability in Apollo Gateway allowed queries with deeply nested and reused named fragments to be prohibitively expensive to query plan, specifically during named fragment expansion. Named fragments were being expanded once per fragment spread during query planning, leading to exponential resource usage when deeply nested and reused fragments were involved. This could lead to excessive resource consumption and denial of service. This has been remediated in @apollo/gateway version 2.10.1.
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Analysis
by VulDB Data Team • 04/08/2025
The vulnerability identified as CVE-2025-32030 affects Apollo Gateway, a critical component in GraphQL microservice architectures that aggregates multiple GraphQL services into a unified endpoint. This system serves as the primary interface for client applications to interact with distributed GraphQL backends, making its stability and performance essential for enterprise applications. The flaw manifests in the query planning phase of the gateway's operation, where it processes complex GraphQL queries containing named fragments that are both deeply nested and frequently reused throughout the query structure.
The technical root cause of this vulnerability lies in the inefficient query planning algorithm that handles named fragment expansion. Specifically, the gateway was designed to expand named fragments once for each fragment spread encountered during query planning, rather than performing a single expansion and reusing the result. This design flaw becomes particularly problematic when dealing with queries that contain deeply nested fragments where the same fragment is referenced multiple times across different levels of the query structure. The mathematical complexity of this approach creates an exponential growth pattern in computational requirements as the nesting depth and reuse frequency of fragments increase.
The operational impact of this vulnerability extends beyond simple performance degradation to potentially causing complete system failure through resource exhaustion. When processing queries with deeply nested and reused named fragments, the gateway's query planner would consume progressively more memory and processing time with each additional layer of nesting or reuse. This exponential resource consumption pattern means that even moderately complex queries could cause the gateway to become unresponsive or crash entirely, resulting in denial of service conditions that would prevent legitimate client applications from accessing the aggregated GraphQL services. The vulnerability particularly affects systems that rely heavily on reusable fragment patterns, which are common in large-scale GraphQL implementations where consistency and code reuse are prioritized.
This vulnerability aligns with CWE-400, which addresses uncontrolled resource consumption, and demonstrates characteristics consistent with denial of service attack vectors that can be exploited through carefully crafted input. The ATT&CK framework categorizes this as a resource exhaustion technique where an adversary can manipulate system resources through input manipulation to cause system instability. The remediation implemented in @apollo/gateway version 2.10.1 addresses this by optimizing the fragment expansion process to perform single expansions and cache results for reuse, eliminating the exponential growth pattern that previously occurred. Organizations should prioritize updating their Apollo Gateway implementations to version 2.10.1 or later to mitigate this vulnerability. Additionally, implementing query complexity limits and monitoring for unusual query patterns can serve as additional defensive measures to prevent exploitation of similar vulnerabilities in other GraphQL implementations or related systems.