fastschema - TOCTOU Race Condition Bypasses OTP Attempt Limit in Account Recovery
Priority LOW 35CWE-367Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0039 33rd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| fastschema | fastschema | up to 0.15.1 | — | No fix listed | CNA |
- fastschema Vendorfastschema Affected up to 0.15.1 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-72584
- 2026-10-03 Alias added: GHSA-qm6j-5qpg-x2x4
References
Advisory 1
Other 1
More fastschema vulnerabilities
- TI-2026-50840 fastschema - Unauthenticated NULL Pointer Dereference DoS in Account Recovery Endpoint CVSS 3.1HIGH 7.5
- TI-2026-50841 fastschema - Stored Cross-Site Scripting via MIME Type Bypass in File Upload CVSS 3.1MEDIUM 5.4
Sources
- CVE-2026-72584 · CVE Program
- CVE-2026-72584 · NVD
- FIRST EPSS
- GHSA-qm6j-5qpg-x2x4 · GitHub Advisory Database · CC BY 4.0
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