fastschema - TOCTOU Race Condition Bypasses OTP Attempt Limit in Account Recovery

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72584
StatePUBLISHED
AssignerTuranSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 11:17:31 UTC
Updated2026-08-10 14:17:29 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 7.4 HIGH from 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Problem Types: CWE-367 | CWE-367 CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition

VersionSourceTypeScoreSeverityVector
3.1309f9ea4-e3e9-4c6c-b79d-e8eb01244f2cSecondary7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNACVSS7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Fastschema Fastschema affected 0.15.1 semver Not specified

References

ReferenceSourceLinkTags
github.com/fastschema/fastschema/blob/main/pkg/auth/local.go 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c github.com
github.com/fastschema/fastschema 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Komiljon Ayubov (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-08-10T10:32:53.000ZCVE Reserved
CNA2026-08-10T10:32:53.000ZPublic Disclosure

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