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CVE-2026-110833— FreeRDP before 3.32.0 Unbounded Memory Retention via RDPDR Proxy

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 在 3.0.0-beta1 至 3.32.0 版本（不含 3.32.0）中，在代理（proxy）模式下重新组装 RDPDR 通道数据片段时，未能正确实施累积大小或绝对大小限制。攻击者可发送一个 FIRST 片段后跟随多个不带 LAST 标记的连续片段，导致每个会话的堆内存流随流量增长而无限扩大，最终耗尽代理服务器的内存资源。

CVSS 5.9 · Medium EPSS 0.25% · P15

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProduct Version RangeStatus
FreeRDP FreeRDP 3.0.0-beta1< 3.32.0 affected
3.32.0 unaffected
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I. Basic Information for CVE-2026-110833

Vulnerability Information
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Vulnerability Title
FreeRDP before 3.32.0 Unbounded Memory Retention via RDPDR Proxy
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP from 3.0.0-beta1 before 3.32.0 fails to enforce cumulative or absolute size limits when reassembling RDPDR channel fragments in the proxy. Attackers can send a FIRST fragment followed by continuation fragments without LAST, growing per-session heap streams proportional to traffic and exhausting proxy memory.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeRDP FreeRDP 3.0.0-beta1 ~ 3.32.0 -

II. Public POCs for CVE-2026-110833

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III. Intelligence Information for CVE-2026-110833

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Other References for CVE-2026-110833 (2)

Same Patch Batch · FreeRDP · 2026-10-14 · 11 CVEs total

CVE-2026-110838 7.5 HIGH FreeRDP shadow before 3.32.0 Pre-Authentication Input Injection via Confirm Active bypass
CVE-2026-110839 7.1 HIGH FreeRDP 3.3.0 before 3.32.0 Heap Out-of-Bounds Write via Grayscale JPEG Clipboard Data
CVE-2026-110837 7.1 HIGH FreeRDP 2.0.0 before 3.32.0 Heap Buffer Overflow via MP3 Audio Decoding
CVE-2026-110829 6.5 MEDIUM FreeRDP 3.0.0 before 3.32.0 Null Pointer Dereference via rdpsnd Fragment
CVE-2026-110836 6.5 MEDIUM FreeRDP 3.0.0 before 3.32.0 Infinite Loop DoS via Gateway Content-Type
CVE-2026-110834 6.5 MEDIUM FreeRDP 2.0.0 before 3.32.0 Denial of Service via Serial IRP Null Handle
CVE-2026-110832 6.5 MEDIUM FreeRDP 2.0.0 before 3.32.0 Memory Exhaustion via DRDYNVC DATA_FIRST
CVE-2026-110830 5.9 MEDIUM FreeRDP before 3.32.0 Denial of Service via Serial IRP_MJ_CREATE
CVE-2026-110831 4.3 MEDIUM FreeRDP 3.13.0 before 3.32.0 Resource Leak via Drive Redirection IRP_MJ_CREATE
CVE-2026-110835 4.0 MEDIUM FreeRDP 3.0.0 before 3.32.0 HTTP Header Injection via Proxy Routing Token

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-400

V. Comments for CVE-2026-110833

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