PT-2026-61581 · Freerdp · Freerdp

Davidkorczynski · CVE-2026-64621 · Published 2026-07-20 · Updated 2026-07-20

Positive Technologies (AI Summary)

CVSS v4.0

9.3

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions FreeRDP versions 3.x through 3.27.1

Description A double-free issue exists in the freerdp client rdp file apply to settings() function (located in client/common/file.c) when parsing the selectedmonitors field of a .rdp connection file. The MonitorIds array is allocated via the settings object, but a raw non-owning pointer to it is freed during a strtoul error path without clearing settings->MonitorIds. This leaves a dangling pointer, which is then freed again by freerdp settings free() during teardown. A remote attacker can trigger this size-controlled double-free in FreeRDP CLI clients such as xfreerdp, sdl-freerdp, or wlfreerdp by convincing a user to open a specially crafted .rdp file containing oversized monitor tokens.

Recommendations Update FreeRDP to version 3.28.0 or later.

Exploit

Fix

Double Free

Weakness Enumeration

CWE-415

Related Identifiers

CVE-2026-64621

GHSA-F27X-FRR8-J9HC

Affected Products

Freerdp

References · 6

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64621.json · Exploit
• https://github.com/FreeRDP/FreeRDP/commit/1f7a716d39b5605bb8a83b0c3c97a6ce386609ef · Patch
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-f27x-frr8-j9hc · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-64621 · Security Note
• https://osv.dev/vulnerability/CVE-2026-64621 · Vendor Advisory
• https://vulncheck.com/advisories/freerdp-before-double-free-via-selectedmonitors · Note