Description
FastAPI Api Key provides a backend-agnostic library that provides an API key system. Version 1.1.0 has a timing side-channel vulnerability in verify_key(). The method applied a random delay only on verification failures, allowing an attacker to statistically distinguish valid from invalid API keys by measuring response latencies. With enough repeated requests, an adversary could infer whether a key_id corresponds to a valid key, potentially accelerating brute-force or enumeration attacks. All users relying on verify_key() for API key authentication prior to the fix are affected. Users should upgrade to version 1.1.0 to receive a patch. The patch applies a uniform random delay (min_delay to max_delay) to all responses regardless of outcome, eliminating the timing correlation. Some workarounds are available. Add an application-level fixed delay or random jitter to all authentication responses (success and failure) before the fix is applied and/or use rate limiting to reduce the feasibility of statistical timing attacks.
INFO
Published Date :
2026-01-21T22:29:24.107Z
Last Modified :
2026-01-22T16:49:16.733Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2026-23996 vulnerability.
| Vendors | Products |
|---|---|
| Athroniaeth |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-23996.
