Vulnerability · Published Aug 10, 2026 · Assigned by TuranSec
CVE-2026-72584fastschema - TOCTOU Race Condition Bypasses OTP Attempt Limit in Account Recovery
High 7.4
In plain English
A high-severity security flaw in fastschema from fastschema. 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 33% of all known vulnerabilities).
Severity (CVSS 3.1)7.4High
Exploit odds (30 days)0.4%top 66.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| fastschema | fastschema | 0 – through 0.15.1 |
Weakness: CWE-367 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
References
- Product third-party-advisory
- Vulnerable File technical-description