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NVD Vulnerability Details :
CVE-2026-25959
Analyzed
More InfoOfficial Page
Source-security-advisories@github.com
View Known Exploited Vulnerability (KEV) details
Published At-25 Feb, 2026 | 21:16
Updated At-27 Feb, 2026 | 14:52

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.05.5MEDIUM
CVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary3.19.8CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Type: Secondary
Version: 4.0
Base score: 5.5
Base severity: MEDIUM
Vector:
CVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Primary
Version: 3.1
Base score: 9.8
Base severity: CRITICAL
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CPE Matches
FreeRDP
freerdp
>>freerdp>>Versions before 3.23.0(exclusive)
cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-416Secondarysecurity-advisories@github.com
CWE ID: CWE-416
Type: Secondary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_cliprdr.c#L1229-L1243security-advisories@github.com
Patch
https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_cliprdr.c#L1337-L1344security-advisories@github.com
Patch
https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_cliprdr.c#L200-L208security-advisories@github.com
Patch
https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_cliprdr.c#L2295security-advisories@github.com
Patch
https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_cliprdr.c#L2323-L2334security-advisories@github.com
Patch
https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_cliprdr.c#L2363security-advisories@github.com
Patch
https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_cliprdr.c#L933security-advisories@github.com
Patch
https://github.com/FreeRDP/FreeRDP/commit/d3e8b3b9365be96a4f11dda149d71b3287227d0asecurity-advisories@github.com
Patch
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-78xg-v4p2-4w3csecurity-advisories@github.com
Exploit
Patch
Vendor Advisory
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-78xg-v4p2-4w3c134c704f-9b21-4f2e-91b3-4a467353bcc0
Exploit
Patch
Vendor Advisory
Hyperlink: https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_cliprdr.c#L1229-L1243
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_cliprdr.c#L1337-L1344
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_cliprdr.c#L200-L208
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_cliprdr.c#L2295
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_cliprdr.c#L2323-L2334
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_cliprdr.c#L2363
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_cliprdr.c#L933
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/FreeRDP/FreeRDP/commit/d3e8b3b9365be96a4f11dda149d71b3287227d0a
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-78xg-v4p2-4w3c
Source: security-advisories@github.com
Resource:
Exploit
Patch
Vendor Advisory
Hyperlink: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-78xg-v4p2-4w3c
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Resource:
Exploit
Patch
Vendor Advisory
Change History
0Changes found
Details not found