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CVE-2026-62317— Logto: ReDoS via unescaped user input in email subaddressing regex (blockSubaddressing)

Quick assessment

Affected
logto-io logto
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

logto-io logto是logto-io组织的一个身份认证和用户管理平台。 logto-io logto 1.41.0之前版本存在资源管理错误漏洞，该漏洞源于邮件子地址黑名单策略使用攻击者控制的域构造正则表达式，导致灾难性回溯，可能造成认证、令牌发放、SSO和管理控制台不可用。

CVSS 7.5 · High EPSS 0.74% · P53

Possible ATT&CK Techniques 1 AI

T1499.002 · Service Exhaustion Flood

Affected Version Matrix 1

VendorProduct Version RangeStatus
logto-io logto < 1.41.0 affected
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I. Basic Information for CVE-2026-62317

Vulnerability Information
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Vulnerability Title
Logto: ReDoS via unescaped user input in email subaddressing regex (blockSubaddressing)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5
Vulnerability Title
logto-io logto 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
logto-io logto是logto-io组织的一个身份认证和用户管理平台。 logto-io logto 1.41.0之前版本存在资源管理错误漏洞，该漏洞源于邮件子地址黑名单策略使用攻击者控制的域构造正则表达式，导致灾难性回溯，可能造成认证、令牌发放、SSO和管理控制台不可用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
logto-io logto < 1.41.0 -

II. Public POCs for CVE-2026-62317

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 11787 chars
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III. Intelligence Information for CVE-2026-62317

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Patches & Fixes for CVE-2026-62317 (2)

Vendor Advisories for CVE-2026-62317 (1)

Vendor Pages for CVE-2026-62317 (1)

Same Patch Batch · logto-io · 2026-08-19 · 3 CVEs total

CVE-2026-63188 8.7 HIGH logto-tunnel serves files outside --experience-path via path traversal
CVE-2026-63187 6.3 MEDIUM Logto: OS command injection vulnerability exists in the Commitlint workflow

IV. Related Vulnerabilities

Same product: logto
Same vendor: logto-io
Same weakness: CWE-1333

V. Comments for CVE-2026-62317

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