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FreeRDP CVE-2026-85089

| EUVDEUVD-2026-70299 HIGH
Use of Uninitialized Resource (CWE-908)
2026-09-03 VulnCheck GHSA-3525-288q-6qj4
Information Disclosure Red Hat Freerdp Suse
7.1
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
7.1 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/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
vuln.today AI
6.5 MEDIUM

Network-reachable via RDP but requires a valid authenticated session (PR:L); only confidentiality impact as leaked heap padding cannot be written back by the receiving client.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
SUSE
6.5 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Red Hat
6.5 MEDIUM
qualitative

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

4
POC Analysis Generated
Sep 08, 2026 - 11:38 vuln.today
Source Code Evidence Fetched
Sep 03, 2026 - 01:28 vuln.today
Analysis Generated
Sep 03, 2026 - 01:28 vuln.today
CVE Published
Sep 03, 2026 - 01:04 cve.org
HIGH 7.1

DescriptionCVE.org

FreeRDP versions 3.0.0 through 3.30.0 (before 3.31.0) transmit uninitialized heap memory in Save Session Info PDU reserved padding fields. Three PDU writers in libfreerdp/core/info.c (rdp_write_logon_info_v2, rdp_write_logon_info_plain, and rdp_write_logon_info_ex) use Stream_Seek instead of Stream_Zero for reserved pad bytes (up to 576 bytes), leaving previously freed heap contents in the outgoing PDU. Because the send buffer is allocated with malloc (not zeroed), stale heap data - which may include cleartext credentials from prior sessions - can be sent to the receiving peer. FreeRDP-based servers using rdpUpdate::SaveSessionInfo and freerdp-proxy (which forwards these PDUs) are affected, allowing disclosure of server/proxy process memory to a downstream client.

AnalysisAI

Uninitialized heap memory disclosure in FreeRDP 3.0.0-3.30.0 exposes up to 576 bytes of stale server or proxy heap contents - potentially including cleartext credentials from prior RDP sessions - to any authenticated downstream RDP client. Three PDU-serialization functions in libfreerdp/core/info.c advance the stream write pointer with Stream_Seek over reserved padding bytes instead of zeroing them with Stream_Zero, leaving prior malloc heap contents in Save Session Info PDUs transmitted to clients. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated RDP session (PR:L - valid credentials for the FreeRDP server or proxy) to a FreeRDP-based server or freerdp-proxy that calls rdpUpdate::SaveSessionInfo. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 7.1 (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N) reflects a network-reachable, low-complexity information disclosure requiring only a valid RDP credential, with high confidentiality impact on the vulnerable system. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade FreeRDP to version 3.31.0 or later; this is the vendor-released patch confirmed by the GitHub release tag and two fixing commits (056cede398d71c1f2540baebc26ec3327a249301 and 483c9388119f06bac420d92053cff9ef94e83bea). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all FreeRDP server and freerdp-proxy deployments in your environment, prioritizing production remote access gateways and assets with internet exposure. …

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Module for Package Hub 15 SP7 Affected
SUSE Linux Enterprise Module for Package Hub 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected

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CVE-2026-85089 vulnerability details – vuln.today
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