CVE-2025-59152

CVE-2025-59152 · X-Forwarded-For Header Spoofing Bypasses Litestar Rate Limiting

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Litestar is an Asynchronous Server Gateway Interface (ASGI) framework. In version 2.17.0, rate limits can be completely bypassed by manipulating the X-Forwarded-For header. This renders IP-based rate limiting ineffective against determined attackers. Litestar's RateLimitMiddleware uses `cache_key_from_request()` to generate cache keys for rate limiting. When an X-Forwarded-For header is present, the middleware trusts it unconditionally and uses its value as part of the client identifier. Since clients can set arbitrary X-Forwarded-For values, each different spoofed IP creates a separate rate limit bucket. An attacker can rotate through different header values to avoid hitting any single bucket's limit. This affects any Litestar application using RateLimitMiddleware with default settings, which likely includes most applications that implement rate limiting. Version 2.18.0 contains a patch for the vulnerability.

CVSS 7.5 · High · EPSS 0.5% · Fix available

Published

2025-10-06T15:23:12.526Z

Updated

2025-10-06T15:35:41.813Z

Stack: python

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