{
  "threat_severity" : "Moderate",
  "public_date" : "2026-08-01T12:22:18Z",
  "bugzilla" : {
    "description" : "FreeRDP: FreeRDP: Denial of Service via crafted WindowIcon async message",
    "id" : "2509985",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2509985"
  },
  "cvss3" : {
    "cvss3_base_score" : "6.5",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
    "status" : "draft"
  },
  "cwe" : "CWE-416",
  "details" : [ "FreeRDP before 3.29.0 contains a client-side heap use-after-free in the async update message proxy for WINDOW_ICON_ORDER when AsyncUpdate is enabled (e.g. xfreerdp /async-update). In update_message_WindowIcon() a shallow CopyMemory() overwrites a freshly allocated lParam->iconInfo with the parser-owned windowIcon->iconInfo pointer. After the parser callback returns, update_recv_window_info_order() frees window_icon.iconInfo, but the queued async message still retains and later dispatches that stale pointer. A malicious or compromised RDP server sending a crafted RAIL Window Alternate Secondary Order with WINDOW_ORDER_ICON can trigger use-after-free, leading to memory corruption and client crash.", "A flaw was found in FreeRDP. A malicious or compromised Remote Desktop Protocol (RDP) server can exploit a heap use-after-free vulnerability when a client connects with asynchronous updates enabled. By sending a specially crafted Window Alternate Secondary Order message, the server can trigger memory corruption, leading to a client crash and a denial of service." ],
  "statement" : "This is a Moderate client-side flaw in FreeRDP. When a user connects to a malicious RDP server with asynchronous updates explicitly enabled, a heap use-after-free vulnerability can be triggered. This leads to memory corruption and a denial of service on the client system, but requires user interaction with a compromised server.",
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Affected",
    "package_name" : "freerdp",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Out of support scope",
    "package_name" : "freerdp",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Affected",
    "package_name" : "freerdp",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Affected",
    "package_name" : "freerdp",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Affected",
    "package_name" : "freerdp",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-67299\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-67299\nhttps://github.com/FreeRDP/FreeRDP/commit/5370fb26fbf034ecd11d3026b6ad639b5fff493f\nhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-34hq-hwjw-q8v3\nhttps://www.vulncheck.com/advisories/freerdp-before-use-after-free-via-windowicon-async-message" ],
  "name" : "CVE-2026-67299",
  "mitigation" : {
    "value" : "To mitigate this issue, avoid connecting to untrusted RDP servers. Additionally, refrain from using the `/async-update` command-line option when launching FreeRDP clients, as this feature is required to trigger the vulnerability.",
    "lang" : "en:us"
  },
  "csaw" : false
}