CVE-2026-54297
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk31th percentile - higher than 31% of all known CVEs
Summary
A vulnerability in the Faraday library allows a DoS attack by sending a specially crafted nested query string. The NestedParamsEncoder decoder does not enforce a maximum nesting depth, leading to stack overflow and crash of the thread or worker process.
Risk Assessment
An attacker can remotely crash an application using Faraday to parse or build URLs with a controlled query string, causing denial of service.
Recommendation
Immediately update the Faraday library to version 1.10.6 or 2.14.3, which include a fix limiting the maximum nesting depth.
Original NVD description (English source)
Faraday is an HTTP client library abstraction layer that provides a common interface over many adapters. From 1.0.0 until 1.10.6 and 2.14.3, Faraday::NestedParamsEncoder, the default nested query parameter encoder/decoder in Faraday, decodes nested query strings without enforcing a maximum nesting depth. A crafted query string causes Faraday to build a deeply nested Ruby Hash structure. The internal dehash routine then recursively walks this attacker-controlled structure without a depth limit. At sufficient depth, Ruby raises an uncaught SystemStackError (stack level too deep), crashing the calling thread or worker. This can lead to denial of service in applications that pass attacker-controlled query strings to Faraday's nested query parsing or URL-building paths. This vulnerability is fixed in 1.10.6 and 2.14.3.