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Freerdp CVE-2026-25959

CRITICAL
Use After Free (CWE-416)
2026-02-25 security-advisories@github.com
Use After Free Freerdp Red Hat Suse
Critical
Disputed · 9.8 NVD
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Severity by source

Sources disagree (Medium–Critical)
GitHub Advisory PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SUSE
CRITICAL
qualitative
Red Hat
5.3 MEDIUM
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
PoC Detected
Feb 27, 2026 - 14:52 vuln.today
Public exploit code
Patch released
Feb 27, 2026 - 14:52 nvd
Patch available
CVE Published
Feb 25, 2026 - 21:16 nvd
CRITICAL 9.8

DescriptionGitHub Advisory

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.

AnalysisAI

Use-after-free in FreeRDP xf_cliprdr_provide_data clipboard handling before 3.23.0. Clipboard data exchange triggers memory corruption. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Send Remote Desktop Protocol request
Delivery
Trigger concurrent clipboard data access
Exploit
Free memory via HashTable_Clear
Execution
Pass freed pointer to XChangeProperty
Impact
Execute arbitrary code
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Vulnerability AssessmentAI

Exploitation FreeRDP version prior to 3.23.0 with clipboard redirection (cliprdr channel) enabled. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 9.8. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Malicious RDP server triggers clipboard data request that causes UAF in the client, enabling code execution.
Remediation Update FreeRDP to 3.23.0. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify and inventory all systems running FreeRDP across the organization and assess which are internet-facing. …

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Module for Package Hub 15 SP7 Fixed
SUSE Linux Enterprise Module for Package Hub 15 SP7 Fixed

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CVE-2026-25959 vulnerability details – vuln.today
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