CVE-2026-67301

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{"bugzilla": {"description": "FreeRDP: FreeRDP: Memory disclosure or denial of service via crafted RDP update orders", "id": "2509994", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2509994"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["FreeRDP before 3.29.0 contains out-of-bounds read vulnerabilities in the async update message proxy for the PolygonSC and PolygonCB primary drawing orders. When AsyncUpdate is enabled (e.g., xfreerdp /async-update), update_message_PolygonSC() and update_message_PolygonCB() allocate a fresh points array but copy point data from the address of the order structure instead of from polygonSC->points / polygonCB->points, resulting in a client-side out-of-bounds read. A malicious or compromised RDP server sending crafted PolygonSC/PolygonCB update orders can trigger memory disclosure or a client crash.", "A flaw was found in FreeRDP. When the `async-update` feature is enabled, a malicious or compromised Remote Desktop Protocol (RDP) server can send specially crafted update orders. This can lead to an out-of-bounds read, potentially exposing sensitive information or causing the client application to crash, resulting in a Denial of Service."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, avoid enabling the `async-update` feature when using FreeRDP clients. This feature is not enabled by default. If `xfreerdp` is used, ensure the `/async-update` command-line option is not specified. Disabling this feature may impact performance in certain RDP sessions where asynchronous updates are beneficial."}, "name": "CVE-2026-67301", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-01T12:22:16Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-67301\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-67301\nhttps://github.com/FreeRDP/FreeRDP/commit/5370fb26fbf034ecd11d3026b6ad639b5fff493f\nhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-vxp3-7g6q-rq2w\nhttps://www.vulncheck.com/advisories/freerdp-before-out-of-bounds-read-via-polygon-async-message-proxy"], "statement": "A Moderate out-of-bounds read flaw in FreeRDP allows a malicious server to cause memory disclosure or crash the client, but only when the non-default async-update feature is explicitly enabled.", "threat_severity": "Moderate"}

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