{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-42256",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-04-26T11:53:27.704Z",
        "datePublished": "2026-05-09T19:38:33.106Z",
        "dateUpdated": "2026-05-11T17:04:42.562Z"
    },
    "containers": {
        "cna": {
            "title": "net-imap: Denial of service via high iteration count for `SCRAM-*` authentication",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-1322",
                            "lang": "en",
                            "description": "CWE-1322: Use of Blocking Code in Single-threaded, Non-blocking Context",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-770",
                            "lang": "en",
                            "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "PRESENT",
                        "privilegesRequired": "NONE",
                        "userInteraction": "PASSIVE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "HIGH",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 6,
                        "baseSeverity": "MEDIUM",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/ruby/net-imap/security/advisories/GHSA-87pf-fpwv-p7m7",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/ruby/net-imap/security/advisories/GHSA-87pf-fpwv-p7m7"
                },
                {
                    "name": "https://github.com/ruby/net-imap/commit/158d0b505074397cdb5ceb58935e42dd2bcfa612",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/ruby/net-imap/commit/158d0b505074397cdb5ceb58935e42dd2bcfa612"
                },
                {
                    "name": "https://github.com/ruby/net-imap/commit/808001bc45c06f7297a7e96d341279e041a7f7f4",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/ruby/net-imap/commit/808001bc45c06f7297a7e96d341279e041a7f7f4"
                },
                {
                    "name": "https://github.com/ruby/net-imap/commit/99f59eab6064955a23debd95410263ad144df758",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/ruby/net-imap/commit/99f59eab6064955a23debd95410263ad144df758"
                },
                {
                    "name": "https://github.com/ruby/net-imap/releases/tag/v0.4.24",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/ruby/net-imap/releases/tag/v0.4.24"
                },
                {
                    "name": "https://github.com/ruby/net-imap/releases/tag/v0.5.14",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/ruby/net-imap/releases/tag/v0.5.14"
                },
                {
                    "name": "https://github.com/ruby/net-imap/releases/tag/v0.6.4",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/ruby/net-imap/releases/tag/v0.6.4"
                }
            ],
            "affected": [
                {
                    "vendor": "ruby",
                    "product": "net-imap",
                    "versions": [
                        {
                            "version": ">= 0.4.0, < 0.4.24",
                            "status": "affected"
                        },
                        {
                            "version": ">= 0.5.0, < 0.5.14",
                            "status": "affected"
                        },
                        {
                            "version": ">= 0.6.0, < 0.6.4",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-05-09T19:38:33.106Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. From versions 0.4.0 to before 0.4.24, 0.5.0 to before 0.5.14, and 0.6.0 to before 0.6.4, when authenticating a connection with SCRAM-SHA1 or SCRAM-SHA256, a hostile server can perform a computational denial-of-service attack on the client process by sending a big iteration count value. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4."
                }
            ],
            "source": {
                "advisory": "GHSA-87pf-fpwv-p7m7",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-05-11T17:04:26.784816Z",
                                "id": "CVE-2026-42256",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-05-11T17:04:42.562Z"
                }
            }
        ]
    }
}