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CVE-2026-73108— RustDesk < 1.4.7 Uncontrolled Memory Allocation DoS via BytesCodec

Quick assessment

Affected
rustdesk rustdesk
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

RustDesk 1.4.7 之前的版本中，BytesCodec 存在一个非受控的推测性内存分配漏洞。在身份验证之前，解码器会信任四字节帧头中编码的有效载荷长度，并在接收实际载荷之前预留相应大小的内存空间。攻击者可以构造特殊的帧头，请求高达 1,073,741,823 字节的容量分配，从而允许未经身份验证的攻击者通过建立并发 TCP 连接来耗尽内存资源，导致拒绝服务（DoS）。该修复措施将帧头触发的推测性预分配上限设定为 256 KiB。

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1480 · Execution Guardrails

Affected Version Matrix 1

VendorProduct Version RangeStatus
rustdesk rustdesk < 1.4.7 affected
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I. Basic Information for CVE-2026-73108

Vulnerability Information
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Vulnerability Title
RustDesk < 1.4.7 Uncontrolled Memory Allocation DoS via BytesCodec
Source: CVE Program / CVE List V5
Vulnerability Description
RustDesk versions before 1.4.7 contain an uncontrolled speculative memory allocation vulnerability in BytesCodec. Before authentication, the decoder trusts the payload length encoded in a four-byte frame header and reserves that amount before receiving the payload. A crafted header can request up to 1,073,741,823 bytes of capacity, allowing unauthenticated attackers to use concurrent TCP connections to cause memory exhaustion and denial of service. The fix caps header-triggered speculative preallocation at 256 KiB.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
rustdesk rustdesk 0 ~ 1.4.7 -

II. Public POCs for CVE-2026-73108

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8033 chars
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III. Intelligence Information for CVE-2026-73108

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Patches & Fixes for CVE-2026-73108 (2)

Vendor Advisories for CVE-2026-73108 (1)

Vendor Pages for CVE-2026-73108 (1)

IV. Related Vulnerabilities

Same product: rustdesk
Same vendor: rustdesk
Same weakness: CWE-770

V. Comments for CVE-2026-73108

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