Twisted: Denial of Service (DoS) in twisted.names via Crafted DNS Compression Pointer Chains_CVE-2026-42304

{
    "lastseen": "",
    "description": "Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.4.0rc2, the twisted.names module is vulnerable to a Denial of Service (DoS) attack via resource exhaustion during DNS name decompression. A remote, unauthenticated attacker can exploit this by sending a crafted TCP DNS packet containing deeply chained compression pointers. This flaw bypasses previous loop-prevention logic, causing the single-threaded Twisted reactor to hang while processing millions of recursive lookups, effectively freezing the server. This vulnerability is fixed in 26.4.0rc2.",
    "published": "2026-05-13T20:20:29.149Z",
    "modified": "2026-05-13T20:20:29.149Z",
    "type": "cve",
    "title": "Twisted: Denial of Service (DoS) in twisted.names via Crafted DNS Compression Pointer Chains",
    "source": "GitHub_M",
    "references": "https://github.com/twisted/twisted/security/advisories/GHSA-grgv-6hw6-v9g4",
    "id": "CVE-2026-42304",
    "bulletinFamily": "",
    "cwe": [
        "CWE-400",
        "CWE-407"
    ],
    "cvelist": null,
    "sourceData": "twisted twisted < 26.4.0rc2",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
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        "baseScore": 0,
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        "cvssV3": {
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    },
    "href": "",
    "category_name": "CVE",
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    "product": "twisted",
    "version": "< 26.4.0rc2",
    "vendor": "twisted",
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}