---
cve: "CVE-2026-62317"
severity: "HIGH"
cvss: 7.5
epss: "52%"
vendor: "logto-io"
kev: false
exploited: false
published: "2026-08-19 20:17:19"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-02T04:11:10+02:00"
---

# CVE-2026-62317

> 7.5 HIGH · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- 021381237511bc0d42f81d65df8b036b01f40547 (Commit)
- 91e55698a42f99438cd41ec2b16a1fc51dbdab8a (Commit)

## Referenzen

- <https://github.com/logto-io/logto/security/advisories/GHSA-qp7j-c3q2-g739>
- <https://github.com/logto-io/logto/pull/9106>
- <https://github.com/logto-io/logto/commit/021381237511bc0d42f81d65df8b036b01f40547>
- <https://github.com/logto-io/logto/releases/tag/v1.41.0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-62317) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_