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    2 vulnerabilities by athroniaeth

    CVE-2026-23996 (GCVE-0-2026-23996)

    Vulnerability from nvd – Published: 2026-01-21 22:29 – Updated: 2026-01-22 16:49
    VLAI
    Title
    FastAPI Api Key has a timing side-channel in verify_key that allows statistical key validity detection
    Summary
    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.
    Severity
    3.7 (Low)
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-208 - Observable Timing Discrepancy
    Assigner
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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    CVE-2026-23996 (GCVE-0-2026-23996)

    Vulnerability from cvelistv5 – Published: 2026-01-21 22:29 – Updated: 2026-01-22 16:49
    VLAI
    Title
    FastAPI Api Key has a timing side-channel in verify_key that allows statistical key validity detection
    Summary
    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.
    Severity
    3.7 (Low)
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-208 - Observable Timing Discrepancy
    Assigner
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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