FreeRDP EUVD-2026-33434

| CVE-2026-44422 HIGH

Use After Free (CWE-416)

2026-05-29 GitHub_M

Information Disclosure Use After Free Memory Corruption Freerdp

8.8

CVSS 3.1 · NVD

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Severity by source

NVD PRIMARY

8.8 HIGH

AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

vuln.today AI

8.8 HIGH

Network-delivered by a malicious server (AV:N) with deterministic ref-id reuse (AC:L) and no attacker auth (PR:N), but requires the victim to connect (UI:R); memory corruption yields high C/I/A.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

SUSE

7.5 HIGH

AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Red Hat

7.5 HIGH

qualitative

Primary rating from NVD.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

8

Analysis Updated

Jun 30, 2026 - 04:16 vuln.today

v5 (cvss_changed)

Analysis Updated

Jun 30, 2026 - 04:15 vuln.today

v4 (cvss_changed)

Analysis Updated

Jun 30, 2026 - 04:15 vuln.today

v3 (cvss_changed)

Analysis Updated

Jun 30, 2026 - 04:13 vuln.today

v2 (cvss_changed)

Re-analysis Queued

Jun 30, 2026 - 03:24 vuln.today

cvss_changed

CVSS changed

Jun 30, 2026 - 03:24 NVD

7.5 (HIGH) 8.8 (HIGH)

Patch available

May 29, 2026 - 21:02 EUVD

Analysis Generated

May 29, 2026 - 20:31 vuln.today

DescriptionNVD

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, FreeRDP's RDPEAR NDR parser accepts one non-null NDR pointer ref-id for multiple logical pointer fields without tracking the pointed object's expected NDR type or ownership. When the same ref-id is reused across two pointer fields, the parser assigns the same heap object to both output fields. The generic destructor later walks each field independently and destroys/frees both pointers. This causes a malicious-server-triggerable heap use-after-free / double-free in the FreeRDP client's RDPEAR authentication-redirection path. This vulnerability is fixed in 3.26.0.

AnalysisAI

Heap use-after-free/double-free in the FreeRDP RDP client (versions prior to 3.26.0) lets a malicious or compromised RDP server corrupt client memory through the RDPEAR authentication-redirection path. The flaw stems from the RDPEAR NDR parser reusing a single non-null pointer ref-id across multiple logical fields, causing the same heap object to be assigned to two outputs and freed twice by the generic destructor. There is no public exploit beyond a proof-of-concept (SSVC: poc), and EPSS exploitation probability is very low (0.05%), but the SSVC technical impact is rated total and a vendor fix is available.

Technical ContextAI

FreeRDP implements Microsoft's Remote Desktop Protocol. The vulnerable component is the RDPEAR (Remote Credential Guard / authentication-redirection) channel, which uses NDR (Network Data Representation) marshalling - the same RPC serialization format used in DCE/RPC and many Windows protocols. NDR pointers carry a ref-id that should uniquely identify each pointed-to object. The parser here does not track an object's expected NDR type or ownership per ref-id, so when a server sends one ref-id for two distinct logical pointer fields, both output fields end up referencing one heap allocation. This is a classic CWE-416 (Use After Free), manifesting as a double-free when the generic destructor independently walks and frees each field, and as a use-after-free if the freed object is reused before the second free.

RemediationAI

Vendor-released patch: upgrade FreeRDP to version 3.26.0 or later, which fixes the RDPEAR NDR pointer ref-id handling; this is the primary and recommended remediation per advisory GHSA-j9q5-7g8m-jc9v. For environments that cannot immediately update the library, the practical compensating control is to avoid connecting FreeRDP clients to untrusted or unverified RDP servers and to restrict outbound RDP (TCP 3389) to known, trusted endpoints, since the attack requires the client to reach a malicious server - the trade-off is reduced connectivity flexibility for users who legitimately connect to varied hosts. Where RDPEAR/Remote Credential Guard authentication redirection is not required, disabling or not negotiating that capability removes the vulnerable code path, at the cost of losing credential-redirection functionality. Distribution users should track and apply their vendor's backported package (e.g. Red Hat via https://access.redhat.com/security/cve/CVE-2026-44422). Do not rely on workarounds long-term; upgrade to 3.26.0.

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Vendor StatusVendor

SUSE

Severity: High

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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EUVD-2026-33434 vulnerability details – vuln.today

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