Vulnerability Description
FreeRDP before 3.28.0 (affected 3.x through 3.27.1) contains a double-free vulnerability in freerdp_client_rdp_file_apply_to_settings() (client/common/file.c) when parsing the selectedmonitors field of a .rdp connection file. The MonitorIds array is allocated through the settings object, and a raw non-owning pointer to it is freed on the strtoul error path without clearing settings->MonitorIds, leaving it dangling; at teardown freerdp_settings_free() frees the same buffer again. An attacker who convinces a victim to open a crafted .rdp file with oversized monitor tokens can trigger a size-controlled double-free in any FreeRDP CLI client (xfreerdp/sdl-freerdp/wlfreerdp) in the default configuration.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Freerdp | Freerdp | >= 3.0.0, < 3.28.0 |
Related Weaknesses (CWE)
References
- https://github.com/FreeRDP/FreeRDP/commit/1f7a716d39b5605bb8a83b0c3c97a6ce386609Patch
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-f27x-frr8-j9hcExploitMitigationVendor Advisory
- https://www.vulncheck.com/advisories/freerdp-before-double-free-via-selectedmoniPatchThird Party Advisory
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-f27x-frr8-j9hcExploitMitigationVendor Advisory
FAQ
What is CVE-2026-64621?
CVE-2026-64621 is a vulnerability with a CVSS score of 7.3 (HIGH). FreeRDP before 3.28.0 (affected 3.x through 3.27.1) contains a double-free vulnerability in freerdp_client_rdp_file_apply_to_settings() (client/common/file.c) when parsing the selectedmonitors field o...
How severe is CVE-2026-64621?
CVE-2026-64621 has been rated HIGH with a CVSS base score of 7.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-64621?
Check the references section above for vendor advisories and patch information. Affected products include: Freerdp Freerdp.