{"id":"CVE-2026-62317","state":"PUBLISHED","title":"Logto: ReDoS via unescaped user input in email subaddressing regex (blockSubaddressing)","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.","publishedAt":"2026-08-19T19:41:23.800Z","updatedAt":"2026-08-21T19:05:49.589Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["logto-io logto"],"affected":[{"vendor":"logto-io","product":"logto","versions":[{"version":"< 1.41.0","status":"affected"}]}],"references":["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"],"weaknesses":["CWE-1333"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/62xxx/CVE-2026-62317.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-62317","state":"PUBLISHED","datePublished":"2026-08-19T19:41:23.800Z","dateUpdated":"2026-08-21T19:05:49.589Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-07-13T19:27:58.314Z"},"containers":{"cna":{"title":"Logto: ReDoS via unescaped user input in email subaddressing regex (blockSubaddressing)","descriptions":[{"lang":"en","value":"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":[{"vendor":"logto-io","product":"logto","versions":[{"version":"< 1.41.0","status":"affected"}]}],"references":[{"url":"https://github.com/logto-io/logto/security/advisories/GHSA-qp7j-c3q2-g739","name":"https://github.com/logto-io/logto/security/advisories/GHSA-qp7j-c3q2-g739","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/logto-io/logto/pull/9106","name":"https://github.com/logto-io/logto/pull/9106","tags":["x_refsource_MISC"]},{"url":"https://github.com/logto-io/logto/commit/021381237511bc0d42f81d65df8b036b01f40547","name":"https://github.com/logto-io/logto/commit/021381237511bc0d42f81d65df8b036b01f40547","tags":["x_refsource_MISC"]},{"url":"https://github.com/logto-io/logto/releases/tag/v1.41.0","name":"https://github.com/logto-io/logto/releases/tag/v1.41.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1333","lang":"en","description":"CWE-1333: Inefficient Regular Expression Complexity","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-19T19:41:23.800Z"},"source":{"advisory":"GHSA-qp7j-c3q2-g739","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/logto-io/logto/security/advisories/GHSA-qp7j-c3q2-g739","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-21T19:05:23.350390Z","id":"CVE-2026-62317","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-21T19:05:49.589Z"}}]}}}