--- 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' - url: 'https://access.redhat.com/errata/RHSA-2026:71390' tags: - nvd - csaf - vex - red-hat epss: 0.00651 epssPercentile: 0.48959 ingestedAt: '2026-08-02T06:17:54.446Z' scores: nvd: 7.5 vendor: 5.9 --- ## Overview 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. ## Affected - `freerdp < 3.29.0` ## Remediation Upgrade past the affected range: - `freerdp 3.29.0` ## Vendor advisories - **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) - **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) - **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) - **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) - **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) - **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) - **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) - **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) - **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) - **RHSA-2026:71390** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-09-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:71390)