Vulnerability · Published Sep 8, 2025 · Assigned by GitHub_M
CVE-2025-57816Fides Webserver API Rate Limiting Vulnerability in Proxied Environments
Medium 6.3
In plain English
A medium-severity security flaw in fides from ethyca. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Fides is an open-source privacy engineering platform. Prior to version 2.69.1, the Fides Webserver API's built-in IP-based rate limiting is ineffective in environments with CDNs, proxies or load balancers. The system incorrectly applies rate limits based on directly connected infrastructure IPs rather than client IPs, and stores counters in-memory rather than in a shared store. This allows attackers to bypass intended rate limits and potentially cause denial of service. This vulnerability only affects deployments relying on Fides's built-in rate limiting for protection. Deployments using external rate limiting solutions (WAFs, API gateways, etc.) are not affected. Version 2.69.1 fixes the issue. There are no application-level workarounds. However, rate limiting may instead be implemented externally at the infrastructure level using a WAF, API Gateway, or similar technology.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | ethyca-fides | 2.69.1 | GHSA-fq34-xw6c-fphf |
| PyPI | ethyca-fides | 2.69.1 | PYSEC-2026-1341 |
Affected products (as reported)
Weakness: CWE-799 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
References
- https://github.com/ethyca/fides/security/advisories/GHSA-fq34-xw6c-fphf x_refsource_CONFIRM
- https://github.com/ethyca/fides/commit/59903c195e2f9f8915a1db94950aefd557033a5c x_refsource_MISC
- https://github.com/ethyca/fides/releases/tag/2.69.1 x_refsource_MISC