PT-2026-67279 · Freerdp · Freerdp

CVE-2026-67299 · Published 2026-08-01 · Updated 2026-08-01

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions FreeRDP versions prior to 3.29.0

Description A client-side heap use-after-free occurs in the async update message proxy for WINDOW ICON ORDER when AsyncUpdate is enabled. In the update message WindowIcon() function, a shallow CopyMemory() overwrites a freshly allocated lParam->iconInfo with the parser-owned windowIcon->iconInfo pointer. Subsequently, update recv window info order() frees window icon.iconInfo, while the queued async message retains and later dispatches the stale pointer. A malicious or compromised RDP server can trigger this by sending a crafted RAIL Window Alternate Secondary Order with WINDOW ORDER ICON, resulting in memory corruption and a client crash.

Recommendations Update to version 3.29.0 or later. As a temporary mitigation, avoid using the /async-update flag when running xfreerdp.

Exploit

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2026-67299

GHSA-34HQ-HWJW-Q8V3

Affected Products

Freerdp

References · 6

• 🔥 https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-34hq-hwjw-q8v3 · Exploit
• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67299.json · Exploit
• https://github.com/FreeRDP/FreeRDP/commit/5370fb26fbf034ecd11d3026b6ad639b5fff493f · Patch
• https://osv.dev/vulnerability/CVE-2026-67299 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-67299 · Security Note
• https://vulncheck.com/advisories/freerdp-before-use-after-free-via-windowicon-async-message · Note