Deno: TLS retry copies stale upgrade hook, risking plaintext traffic_CVE-2026-44726

{
    "lastseen": "",
    "description": "Deno is a JavaScript, TypeScript, and WebAssembly runtime. From 2.0.0 until 2.7.8, a flaw in Deno's Node.js tls compatibility layer could cause a TLS client to transmit application data in plaintext after a connection retry. When `autoSelectFamily was enabled and the first address-family attempt failed, the socket reinitialization path reused a stale TLS upgrade hook that was bound to the original, failed handle. As a result, the replacement TCP connection was never upgraded to TLS, and any data the application wrote before the secureConnect event travelled over the network unencrypted. A network attacker positioned to cause the initial connection attempt to fail (for example, by dropping IPv6 traffic on a dual-stack host) could deterministically trigger the fallback path and observe or tamper with traffic that the application believed was TLS-protected. This vulnerability is fixed in 2.7.8.",
    "published": "2026-06-23T17:24:02.702Z",
    "modified": "2026-06-23T17:24:02.702Z",
    "type": "cve",
    "title": "Deno: TLS retry copies stale upgrade hook, risking plaintext traffic",
    "source": "GitHub_M",
    "references": "https://github.com/denoland/deno/security/advisories/GHSA-chqv-56wv-7564",
    "id": "CVE-2026-44726",
    "bulletinFamily": "",
    "cwe": [
        "CWE-319"
    ],
    "cvelist": null,
    "sourceData": "denoland deno >= 2.0.0, < 2.7.8",
    "sourceHref": "",
    "cvss": {
        "score": 7.4,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
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        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
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            "baseScore": 0,
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "deno",
    "version": ">= 2.0.0, < 2.7.8",
    "vendor": "denoland",
    "ai_description": "",
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    "ai_score": 0
}