Paper/Archive/CVE-2026-25959

CVE-2026-25959

FreeRDP FreeRDP — FreeRDP has heap-use-after-free in xf_cliprdr_provide_data_

CVSS 9.8 (NVD)9.8 / 10 × 3029.4 Not in CISA KEV+300.0 EPSS percentile 50.9.509 × 2010.2 Exploit: SSVC poc+1010.0 SSVC exploitation: poc+100.0

Description · from the CVE record

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, `xf_cliprdr_provide_data_` passes freed `pDstData` to `XChangeProperty` because the cliprdr channel thread calls `xf_cliprdr_server_format_data_response` which converts and uses the clipboard data without holding any lock, while the X11 event thread concurrently calls `xf_cliprdr_clear_cached_data` → `HashTable_Clear` which frees the same data via `xf_cached_data_free`, triggering a heap use after free. Version 3.23.0 fixes the issue.

Affected

ProductAffectedFixed inSource

FreeRDP< 3.23.0–CNA

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

GitHub_M (CNA)5.5CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: partial

References