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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 3.0.0 至 3.30.0 版本（3.31.0 之前）在“保存会话信息 PDU”的保留填充字段中传输了未初始化的堆内存。 libfreerdp/core/info.c 中的三个 PDU 写入函数（ 、 和 ）在处理保留填充字节（最多 576 字节）时，使用了 而非 ，导致之前释放的堆内容残留在发出的 PDU 中。由于发送缓冲区是通过 分配的（未进行零值初始化），其中可能包含来自先前会话的明文凭据等陈旧堆数据，这些陈旧数据会被发送到接收方。 使用 的基于 FreeRDP 的服务器，以及转发这些 PD

CVSS 6.5 · Medium
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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

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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