A time-of-check/time-of-use (TOCTOU) race condition in fastschema through v0.15.1 allows an unauthenticated remote attacker to bypass the OTP attempt limit on the account recovery flow, enabling brute-force attacks on 6-digit OTP codes.
Metrics
Affected Vendors & Products
References
History
Tue, 11 Aug 2026 15:45:00 +0000
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Fastschema
Fastschema fastschema |
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Fastschema
Fastschema fastschema |
Mon, 10 Aug 2026 14:30:00 +0000
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ssvc
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Mon, 10 Aug 2026 12:00:00 +0000
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| Description | A time-of-check/time-of-use (TOCTOU) race condition in fastschema through v0.15.1 allows an unauthenticated remote attacker to bypass the OTP attempt limit on the account recovery flow, enabling brute-force attacks on 6-digit OTP codes. The verifyOTPSession function in pkg/auth/local.go reads and increments the attempt counter in separate non-atomic operations, allowing concurrent requests to observe the same attempt count below the threshold and proceed past the limit check before any update is committed. | A time-of-check/time-of-use (TOCTOU) race condition in fastschema through v0.15.1 allows an unauthenticated remote attacker to bypass the OTP attempt limit on the account recovery flow, enabling brute-force attacks on 6-digit OTP codes. |
Mon, 10 Aug 2026 11:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | A time-of-check/time-of-use (TOCTOU) race condition in fastschema through v0.15.1 allows an unauthenticated remote attacker to bypass the OTP attempt limit on the account recovery flow, enabling brute-force attacks on 6-digit OTP codes. The verifyOTPSession function in pkg/auth/local.go reads and increments the attempt counter in separate non-atomic operations, allowing concurrent requests to observe the same attempt count below the threshold and proceed past the limit check before any update is committed. | |
| Title | fastschema - TOCTOU Race Condition Bypasses OTP Attempt Limit in Account Recovery | |
| Weaknesses | CWE-367 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: TuranSec
Published: 2026-08-10T10:41:27.492Z
Updated: 2026-08-10T13:14:19.784Z
Reserved: 2026-08-10T10:32:53.854Z
Link: CVE-2026-72584
Updated: 2026-08-10T13:13:58.816Z
Status : Received
Published: 2026-08-10T11:17:31.390
Modified: 2026-08-10T14:17:29.380
Link: CVE-2026-72584
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