# CVE-2026-62317

## Summary

- **CVE ID:** CVE-2026-62317
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-1333
- **Published:** Aug 19, 2026
- **Last Modified:** Aug 21, 2026

## Description

Logto is the modern, open-source auth infrastructure for SaaS and AI apps. Prior to 1.41.0, Logto's email subaddressing blocklist in packages/core/src/libraries/sign-in-experience/email-blocklist-policy.ts used the attacker-controlled domain from email input to construct subaddressingRegex when blockSubaddressing was enabled. The permissive emailRegEx accepted multiple at signs and regular expression metacharacters, and POST /api/experience/verification/verification-code could therefore cause catastrophic backtracking in subaddressingRegex.test(email). The resulting event-loop stall could make authentication, token issuance, SSO, and the administrative console unavailable. This issue is fixed in version 1.41.0.

## Affected Products

- logto-io — logto (< 1.41.0)

## References

- [CNA](https://github.com/logto-io/logto/security/advisories/GHSA-qp7j-c3q2-g739)
- [CNA](https://github.com/logto-io/logto/pull/9106)
- [CNA](https://github.com/logto-io/logto/commit/021381237511bc0d42f81d65df8b036b01f40547)
- [CNA](https://github.com/logto-io/logto/releases/tag/v1.41.0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.63%
- **EPSS Percentile:** 48.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._