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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 是一个面向 SaaS 和 AI 应用现代化、开源的身份验证基础设施。在版本 1.41.0 之前，Logto 在文件 中实现的电子邮件子地址屏蔽黑名单（email subaddressing blocklist）存在安全缺陷：当启用 选项时，该代码使用由用户输入的电子邮件地址中攻击者可控的域名部分来构建 正则表达式。由于配套的 正则表达式设计过于宽松，允许输入中包含多个“@”符号以及正则表达式元字符，攻击者可通过构造特制的恶意电子邮件地址，使程序在处理 接口请求时，在调用 方法过程中引发灾难性回溯（cat

CVSS 7.5 · High EPSS 0.52% · P42

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

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
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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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