net-imap vulnerable to STARTTLS stripping via invalid response timing_CVE-2026-42246

{
    "lastseen": "",
    "description": "Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.3.10, 0.4.24, 0.5.14, and 0.6.4, a man-in-the-middle attacker can cause Net::IMAP#starttls to return \"successfully\", without starting TLS. This issue has been patched in versions 0.3.10, 0.4.24, 0.5.14, and 0.6.4.",
    "published": "2026-05-09T19:33:17.880Z",
    "modified": "2026-05-09T19:33:17.880Z",
    "type": "cve",
    "title": "net-imap vulnerable to STARTTLS stripping via invalid response timing",
    "source": "GitHub_M",
    "references": "https://github.com/ruby/net-imap/security/advisories/GHSA-vcgp-9326-pqcp\nhttps://github.com/ruby/net-imap/commit/0ede4c40b1523dfeaf95777b2678e54cc0fd9618\nhttps://github.com/ruby/net-imap/commit/24a4e770b43230286a05aa2a9746cdbb3eb8485e\nhttps://github.com/ruby/net-imap/commit/97e2488fb5401a1783bddd959dde007d9fbce42c\nhttps://github.com/ruby/net-imap/commit/f79d35bf5833f186e81044c57c843eda30c873da\nhttps://github.com/ruby/net-imap/releases/tag/v0.3.10\nhttps://github.com/ruby/net-imap/releases/tag/v0.4.24\nhttps://github.com/ruby/net-imap/releases/tag/v0.5.14",
    "id": "CVE-2026-42246",
    "bulletinFamily": "",
    "cwe": [
        "CWE-392",
        "CWE-393",
        "CWE-754",
        "CWE-636",
        "CWE-841"
    ],
    "cvelist": null,
    "sourceData": "ruby net-imap < 0.3.10\nruby 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": 7.6,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/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": "< 0.3.10",
    "vendor": "ruby",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}