What’s Vulnerable › Vulnerabilities

CVE-2026-72584: fastschema - TOCTOU Race Condition Bypasses OTP Attempt Limit in Account Recovery

• Severity: high (CVSS 7.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-10 · updated 2026-10-24
• Weakness: CWE-367

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

• fastschema: through 0.15.1

References

• https://github.com/fastschema/fastschema
• https://github.com/fastschema/fastschema/blob/main/pkg/auth/local.go

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