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CVE-2026-112279— rdesktop through 1.9.0 Heap Out-of-Bounds Read via process_bmpcache2

Quick assessment

Affected
rdesktop rdesktop
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.

rdesktop 1.9.0 及更早版本在 orders.c 中的 process_bmpcache2() 函数存在堆越界读取漏洞。该漏洞允许恶意的 RDP 服务器通过精心构造的修订版 2 位图缓存指令，导致客户端崩溃。攻击者可发送宽度或高度过大的未压缩指令，或发送模式位（mode nibble）下溢且载荷过短的指令，从而引发 memcpy() 函数读取超出接收缓冲区范围的数据，最终造成拒绝服务（DoS）。

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
rdesktop rdesktop ≤ 1.9.0 affected
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I. Basic Information for CVE-2026-112279

Vulnerability Information
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Vulnerability Title
rdesktop through 1.9.0 Heap Out-of-Bounds Read via process_bmpcache2
Source: CVE Program / CVE List V5
Vulnerability Description
rdesktop through 1.9.0 contains a heap out-of-bounds read vulnerability in process_bmpcache2() in orders.c that allows malicious RDP servers to crash clients via crafted revision-2 bitmap cache orders. Attackers can send an uncompressed order with large width/height or an underflowing mode nibble and short payload, causing memcpy() reads past the receive buffer and denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
rdesktop rdesktop 0 ~ 1.9.0 -

II. Public POCs for CVE-2026-112279

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III. Intelligence Information for CVE-2026-112279

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Patches & Fixes for CVE-2026-112279 (1)

Vendor Advisories for CVE-2026-112279 (1)

Security Blog Posts for CVE-2026-112279 (1)

Other References for CVE-2026-112279 (1)

Same Patch Batch · rdesktop · 2026-10-19 · 3 CVEs total

CVE-2026-112278 6.5 MEDIUM rdesktop through 1.9.0 Heap Out-of-Bounds Read via process_raw_bmpcache
CVE-2026-112277 6.5 MEDIUM rdesktop through 1.9.0 Heap Out-of-Bounds Read via process_plane

IV. Related Vulnerabilities

Same product: rdesktop
Same vendor: rdesktop
Same weakness: CWE-125

V. Comments for CVE-2026-112279

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