In short
- CVE-2026-54297 is a HIGH (CVSS 7.5) vulnerability affecting faraday, faraday (faraday project).
- Chance of exploitation in the next 30 days (EPSS): 0.76%, higher than 55.4% of all vulnerabilities.
- Fix: update to 1.10.6, 2.14.3 or later.
| Package | Affected versions | Patched versions |
|---|
| faraday RubyGems | ≥ 1.0.0, < 1.10.6≥ 2.0.0, < 2.14.3
| 1.10.62.14.3
|
| faraday | ≥ 1.0.0, < 1.10.6≥ 2.0.0, < 2.14.3
| 1.10.62.14.3
|
Description
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 such as:
a[x][x][x][x]...[x]=1
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 has been patched in version 2.14.3 and backported to 1.10.6.
NVD description
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.
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