net-imap: Denial of service via high iteration count for `SCRAM-*` authentication_CVE-2026-42256

{
    "lastseen": "",
    "description": "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.",
    "published": "2026-05-09T19:38:33.106Z",
    "modified": "2026-05-09T19:38:33.106Z",
    "type": "cve",
    "title": "net-imap: Denial of service via high iteration count for `SCRAM-*` authentication",
    "source": "GitHub_M",
    "references": "https://github.com/ruby/net-imap/security/advisories/GHSA-87pf-fpwv-p7m7\nhttps://github.com/ruby/net-imap/commit/158d0b505074397cdb5ceb58935e42dd2bcfa612\nhttps://github.com/ruby/net-imap/commit/808001bc45c06f7297a7e96d341279e041a7f7f4\nhttps://github.com/ruby/net-imap/commit/99f59eab6064955a23debd95410263ad144df758\nhttps://github.com/ruby/net-imap/releases/tag/v0.4.24\nhttps://github.com/ruby/net-imap/releases/tag/v0.5.14\nhttps://github.com/ruby/net-imap/releases/tag/v0.6.4",
    "id": "CVE-2026-42256",
    "bulletinFamily": "",
    "cwe": [
        "CWE-1322",
        "CWE-770"
    ],
    "cvelist": null,
    "sourceData": "ruby net-imap >= 0.4.0, < 0.4.24\nruby net-imap >= 0.5.0, < 0.5.14\nruby net-imap >= 0.6.0, < 0.6.4",
    "sourceHref": "",
    "cvss": {
        "score": 6,
        "severity": "MEDIUM",
        "vector": "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"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "net-imap",
    "version": ">= 0.4.0, < 0.4.24",
    "vendor": "ruby",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}