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CVE-2026-85089— FreeRDP before 3.31.0 Information Disclosure via uninitialized heap memory

Quick assessment

Affected
FreeRDP FreeRDP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreeRDP是FreeRDP团队开源的一款远程桌面协议(RDP)的实现。 FreeRDP 3.0.0至3.31.0之前版本存在资源管理错误漏洞，该漏洞源于Save Session Info PDU保留填充字段中使用Stream_Seek而非Stream_Zero，导致未初始化的堆内存被传输，可能泄露先前会话的明文凭据及服务器或代理进程内存。

CVSS 6.5 · Medium EPSS 0.38% · P31

Affected Version Matrix 2

VendorProduct Version RangeStatus
FreeRDP FreeRDP 3.0.0< 3.31.0 affected
3.31.0 unaffected
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I. Basic Information for CVE-2026-85089

Vulnerability Information
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Vulnerability Title
FreeRDP before 3.31.0 Information Disclosure via uninitialized heap memory
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对未经初始化资源的使用
Source: CVE Program / CVE List V5
Vulnerability Title
FreeRDP 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeRDP是FreeRDP团队开源的一款远程桌面协议(RDP)的实现。 FreeRDP 3.0.0至3.31.0之前版本存在资源管理错误漏洞，该漏洞源于Save Session Info PDU保留填充字段中使用Stream_Seek而非Stream_Zero，导致未初始化的堆内存被传输，可能泄露先前会话的明文凭据及服务器或代理进程内存。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeRDP FreeRDP 3.0.0 ~ 3.31.0 -

II. Public POCs for CVE-2026-85089

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III. Intelligence Information for CVE-2026-85089

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Patches & Fixes for CVE-2026-85089 (2)

Vendor Advisories for CVE-2026-85089 (2)

Vendor Pages for CVE-2026-85089 (2)

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-908

V. Comments for CVE-2026-85089

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