CVE-2026-25959
published 2026-02-25CVE-2026-25959: FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, `xf_cliprdr_provide_data_` passes freed `pDstData` to…
PriorityP354critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.57%
43.6th percentile
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
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | freerdp2 | < freerdp3 3.23.0+dfsg-1 (forky) | freerdp3 3.23.0+dfsg-1 (forky) |
| debian | freerdp3 | < freerdp3 3.23.0+dfsg-1 (forky) | freerdp3 3.23.0+dfsg-1 (forky) |
| freerdp | freerdp | < 3.23.0 | 3.23.0 |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvdv4.05.5MEDIUMCVSS: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
osv5.5MEDIUM
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
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VulDB
FreeRDP up to 3.22.x xf_cliprdr_provide_data_ use after free (GHSA-78xg-v4p2-4w3c / Nessus ID 300123)
vuldb·2026-05-13·CVSS 5.5
CVE-2026-25959 [MEDIUM] FreeRDP up to 3.22.x xf_cliprdr_provide_data_ use after free (GHSA-78xg-v4p2-4w3c / Nessus ID 300123)
A vulnerability marked as critical has been reported in FreeRDP up to 3.22.x. This affects the function xf_cliprdr_provide_data_. The manipulation leads to use after free.
This vulnerability is referenced as CVE-2026-25959. Remote exploitation of the attack is possible. No exploit is available.
It is suggested to upgrade the affected component.
OSV
CVE-2026-25959: FreeRDP is a free implementation of the Remote Desktop Protocol
osv·2026-02-25·CVSS 5.5
CVE-2026-25959 [MEDIUM] CVE-2026-25959: FreeRDP is a free implementation of the Remote Desktop Protocol
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.
Ubuntu
FreeRDP vulnerabilities
vendor_ubuntu·2026-03-18
CVE-2026-25954 FreeRDP vulnerabilities
Title: FreeRDP vulnerabilities
Summary: Several security issues were fixed in FreeRDP.
It was discovered that FreeRDP incorrectly handled certain RDP packets. A
remote attacker could use this issue to cause FreeRDP to crash, resulting
in a denial of service, or possibly execute arbitrary code.
Instructions: In general, a standard system update will make all the necessary changes.
Red Hat
freerdp: FreeRDP: Denial of Service via heap use-after-free in clipboard handling
vendor_redhat·2026-02-25·CVSS 5.5
CVE-2026-25959 [MEDIUM] CWE-825 freerdp: FreeRDP: Denial of Service via heap use-after-free in clipboard handling
freerdp: FreeRDP: Denial of Service via heap use-after-free in clipboard handling
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.
A flaw was found in FreeRDP, a free implementation of the Remote Desktop Protocol. A remote attacker could exploit a race condition in the clipboard handling feature. This vulnerability,
Debian
CVE-2026-25959: freerdp2 - FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to versio...
vendor_debian·2026·CVSS 5.5
CVE-2026-25959 [MEDIUM] CVE-2026-25959: freerdp2 - FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to versio...
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.
Scope: local
bookworm: open
bullseye: open
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-25959 freerdp: FreeRDP: Denial of Service via heap use-after-free in clipboard handling
bugzilla·2026-02-25·CVSS 9.8
CVE-2026-25959 [CRITICAL] CVE-2026-25959 freerdp: FreeRDP: Denial of Service via heap use-after-free in clipboard handling
CVE-2026-25959 freerdp: FreeRDP: Denial of Service via heap use-after-free in clipboard handling
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.
Bugzilla
CVE-2026-25959 freerdp: FreeRDP: Denial of Service via heap use-after-free in clipboard handling [fedora-42]
bugzilla·2026-02-25·CVSS 5.5
CVE-2026-25959 [MEDIUM] CVE-2026-25959 freerdp: FreeRDP: Denial of Service via heap use-after-free in clipboard handling [fedora-42]
CVE-2026-25959 freerdp: FreeRDP: Denial of Service via heap use-after-free in clipboard handling [fedora-42]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Discussion:
This bug is already fixed in a published Bodhi update.
---
FEDORA-2026-53fe996a57 (freerdp-3.23.0-1.fc42) has been submitted as an update to Fedora 42.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-53fe996a57
Bugzilla
CVE-2026-25959 freerdp2: FreeRDP: Denial of Service via heap use-after-free in clipboard handling [fedora-42]
bugzilla·2026-02-25·CVSS 5.5
CVE-2026-25959 [MEDIUM] CVE-2026-25959 freerdp2: FreeRDP: Denial of Service via heap use-after-free in clipboard handling [fedora-42]
CVE-2026-25959 freerdp2: FreeRDP: Denial of Service via heap use-after-free in clipboard handling [fedora-42]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Discussion:
This message is a reminder that Fedora Linux 42 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 42 on 2026-05-13.
It is Fedora's policy to close all bug reports from releases that are no longer
maintained. At that time this bug will be closed as EOL if it remains open with a
'version' of '42'.
Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintai
Wiz
CVE-2026-25959 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 5.5
CVE-2026-25959 [MEDIUM] CVE-2026-25959 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-25959 :
NixOS vulnerability analysis and mitigation
xf_cliprdr_provide_data_
pDstData
XChangeProperty
xf_cliprdr_server_format_data_response
xf_cliprdr_clear_cached_data
HashTable_Clear
xf_cached_data_free
Source : NVD
## 5.5
Score
Published February 25, 2026
Severity MEDIUM
CNA Score 5.5
Affected Technologies
NixOS
Wolfi
Has Public Exploit Yes
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 29.5
Exploitation Probability (EPSS) 0.1
Affected packages and libraries
freerdp-libs-debuginfo
libwinpr-devel
Sources
NVD
Alpine 3.10, 3.11, 3.12, 3.13, 3.14, 3.15, 3.16, 3.17, 3.18, 3.19, 3.20, 3.21, 3.22, 3.23, edge Severity CRITICAL Has Fix Added at: Mar 02, 2026
Chainguard Has Fix Added a
https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_cliprdr.c#L1229-L1243https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_cliprdr.c#L1337-L1344https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_cliprdr.c#L200-L208https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_cliprdr.c#L2295https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_cliprdr.c#L2323-L2334https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_cliprdr.c#L2363https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_cliprdr.c#L933https://github.com/FreeRDP/FreeRDP/commit/d3e8b3b9365be96a4f11dda149d71b3287227d0ahttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-78xg-v4p2-4w3chttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-78xg-v4p2-4w3c
2026-02-25
Published