matrix-sdk-base is vulnerable to DoS via custom m.room.join_rules event values_CVE-2025-66622

{
    "lastseen": "",
    "description": "matrix-sdk-base is the base component to build a Matrix client library. Versions 0.14.1 and prior are unable to handle responses that include custom m.room.join_rules values due to a serialization bug. This can be exploited to cause a denial-of-service condition, if a user is invited to a room with non-standard join rules, the crate's sync process will stall, preventing further processing for all rooms. This is fixed in version 0.16.0.",
    "published": "2025-12-09T02:07:18.831Z",
    "modified": "2025-12-09T02:07:18.831Z",
    "type": "cve",
    "title": "matrix-sdk-base is vulnerable to DoS via custom m.room.join_rules event values",
    "source": "GitHub_M",
    "references": "https://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-jj6p-3m75-g2p3\nhttps://github.com/matrix-org/matrix-rust-sdk/pull/5924\nhttps://github.com/matrix-org/matrix-rust-sdk/commit/4ea0418abefab2aa93f8851a4d39c723e703e6b0\nhttps://rustsec.org/advisories/RUSTSEC-2025-0135.html",
    "id": "CVE-2025-66622",
    "bulletinFamily": "",
    "cwe": [
        "CWE-755"
    ],
    "cvelist": null,
    "sourceData": "matrix-org matrix-rust-sdk < 0.16.0",
    "sourceHref": "",
    "cvss": {
        "score": 1.3,
        "severity": "LOW",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
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        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
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            "privilegesRequired": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "matrix-rust-sdk",
    "version": "< 0.16.0",
    "vendor": "matrix-org",
    "ai_description": "",
    "ai_severity": "",
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    "ai_score": 0
}