{"id":"CVE-2026-67301","title":"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","summary":"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_Polygo…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-125"],"vendor":"freerdp","product":"freerdp","affected":["freerdp < 3.29.0"],"patched":["freerdp 3.29.0"],"published":"2026-08-01","updated":"2026-09-08","sourceUpdated":"2026-09-08T14:27:34.270","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-67301","references":[{"url":"https://github.com/FreeRDP/FreeRDP/commit/5370fb26fbf034ecd11d3026b6ad639b5fff493f","label":"disclosure@vulncheck.com"},{"url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-vxp3-7g6q-rq2w","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/freerdp-before-out-of-bounds-read-via-polygon-async-message-proxy","label":"disclosure@vulncheck.com"},{"url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-vxp3-7g6q-rq2w","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-67301.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-67301"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2509994"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-67301"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67301"},{"url":"https://access.redhat.com/errata/RHSA-2026:61378"},{"url":"https://access.redhat.com/errata/RHSA-2026:62571"},{"url":"https://access.redhat.com/errata/RHSA-2026:65855"},{"url":"https://access.redhat.com/errata/RHSA-2026:61379"},{"url":"https://access.redhat.com/errata/RHSA-2026:66281"},{"url":"https://access.redhat.com/errata/RHSA-2026:66282"},{"url":"https://access.redhat.com/errata/RHSA-2026:68707"},{"url":"https://access.redhat.com/errata/RHSA-2026:68706"}],"tags":["nvd","csaf","vex","red-hat"],"epss":0.00354,"epssPercentile":0.28995,"ingestedAt":"2026-08-02T06:17:54.446Z","scores":{"nvd":7.5,"vendor":5.9},"slug":"CVE-2026-67301","body":"## Overview\n\nFreeRDP 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.\n\n## Affected\n\n- `freerdp < 3.29.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `freerdp 3.29.0`\n\n## Vendor advisories\n\n- **RHSA-2026:61378** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61378)\n- **RHSA-2026:62571** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-09-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:62571)\n- **RHSA-2026:65855** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) · released 2026-09-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:65855)\n- **RHSA-2026:61379** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61379)\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 7 · no fix planned: Red Hat Enterprise Linux 7 · updated 2026-09-10 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-67301.json)\n- **RHSA-2026:66281** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66281)\n- **RHSA-2026:66282** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8) · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66282)\n- **RHSA-2026:68707** · Red Hat · fixed in: Red Hat Enterprise Linux Server (v. 7 ELS), Red Hat Enterprise Linux Server Optional (v. 7 ELS) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68707)\n- **RHSA-2026:68706** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68706)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}