CVE-2026-62317 (GCVE-0-2026-62317)
Vulnerability from cvelistv5
Published
2026-08-19 19:41
Modified
2026-08-21 19:05
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-1333 - Inefficient Regular Expression Complexity
Summary
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.
References
Impacted products
Vendor Product Version
logto-io logto Version: < 1.41.0
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-62317",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-21T19:05:23.350390Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-21T19:05:49.589Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/logto-io/logto/security/advisories/GHSA-qp7j-c3q2-g739"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "logto",
          "vendor": "logto-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.41.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Logto is the modern, open-source auth infrastructure for SaaS and AI apps. Prior to 1.41.0, Logto\u0027s 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."
        }
      ],
      "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",
              "description": "CWE-1333: Inefficient Regular Expression Complexity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T19:41:23.800Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/logto-io/logto/security/advisories/GHSA-qp7j-c3q2-g739",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/logto-io/logto/security/advisories/GHSA-qp7j-c3q2-g739"
        },
        {
          "name": "https://github.com/logto-io/logto/pull/9106",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/logto-io/logto/pull/9106"
        },
        {
          "name": "https://github.com/logto-io/logto/commit/021381237511bc0d42f81d65df8b036b01f40547",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/logto-io/logto/commit/021381237511bc0d42f81d65df8b036b01f40547"
        },
        {
          "name": "https://github.com/logto-io/logto/releases/tag/v1.41.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/logto-io/logto/releases/tag/v1.41.0"
        }
      ],
      "source": {
        "advisory": "GHSA-qp7j-c3q2-g739",
        "discovery": "UNKNOWN"
      },
      "title": "Logto: ReDoS via unescaped user input in email subaddressing regex (blockSubaddressing)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-62317",
    "datePublished": "2026-08-19T19:41:23.800Z",
    "dateReserved": "2026-07-13T19:27:58.314Z",
    "dateUpdated": "2026-08-21T19:05:49.589Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-62317\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-21T19:05:23.350390Z\"}}}], \"references\": [{\"url\": \"https://github.com/logto-io/logto/security/advisories/GHSA-qp7j-c3q2-g739\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-08-21T19:05:45.443Z\"}}], \"cna\": {\"title\": \"Logto: ReDoS via unescaped user input in email subaddressing regex (blockSubaddressing)\", \"source\": {\"advisory\": \"GHSA-qp7j-c3q2-g739\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"logto-io\", \"product\": \"logto\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 1.41.0\"}]}], \"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\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Logto is the modern, open-source auth infrastructure for SaaS and AI apps. Prior to 1.41.0, Logto\u0027s 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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-1333\", \"description\": \"CWE-1333: Inefficient Regular Expression Complexity\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-08-19T19:41:23.800Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-62317\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-21T19:05:49.589Z\", \"dateReserved\": \"2026-07-13T19:27:58.314Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-08-19T19:41:23.800Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.