FreeRDP has heap-buffer-overflow in clear_decompress_CVE-2026-23531

{
    "lastseen": "",
    "description": "FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, in ClearCodec, when `glyphData` is present, `clear_decompress` calls `freerdp_image_copy_no_overlap` without validating the destination rectangle, allowing an out-of-bounds read/write via crafted RDPGFX surface updates. A malicious server can trigger a client\u2011side heap buffer overflow, causing a crash (DoS) and potential heap corruption with code\u2011execution risk depending on allocator behavior and surrounding heap layout. Version 3.21.0 contains a patch for the issue.",
    "published": "2026-01-19T17:01:01.380Z",
    "modified": "2026-01-19T17:01:01.380Z",
    "type": "cve",
    "title": "FreeRDP has heap-buffer-overflow in clear_decompress",
    "source": "GitHub_M",
    "references": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-xj5h-9cr5-23c5\nhttps://github.com/FreeRDP/FreeRDP/blob/38514dfa5813aa945a86cfbcec279033f8394468/libfreerdp/codec/clear.c#L1139-L1145\nhttps://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0",
    "id": "CVE-2026-23531",
    "bulletinFamily": "",
    "cwe": [
        "CWE-122"
    ],
    "cvelist": null,
    "sourceData": "FreeRDP FreeRDP < 3.21.0",
    "sourceHref": "",
    "cvss": {
        "score": 7.7,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P",
        "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": "FreeRDP",
    "version": "< 3.21.0",
    "vendor": "FreeRDP",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}