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CVE-2026-67291— FreeRDP before 3.29.0 Heap Out-of-Bounds Read via GLYPH_FRAGMENT_ADD

Quick assessment

Affected
FreeRDP FreeRDP
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.

FreeRDP是FreeRDP团队开源的一款远程桌面协议(RDP)的实现。 FreeRDP 3.29.0之前版本存在缓冲区错误漏洞，该漏洞源于libfreerdp/cache/glyph.c文件中的update_process_glyph_fragments()/glyph_cache_fragment_put()函数在处理GLYPH_FRAGMENT_ADD更新时未验证声明片段大小是否适合接收缓冲区，可能导致恶意RDP服务器造成越界读取和客户端崩溃。

CVSS 7.5 · High EPSS 0.41% · P33

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
FreeRDP FreeRDP < 3.29.0 affected
3.29.0 unaffected
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I. Basic Information for CVE-2026-67291

Vulnerability Information
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Vulnerability Title
FreeRDP before 3.29.0 Heap Out-of-Bounds Read via GLYPH_FRAGMENT_ADD
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains a heap out-of-bounds read in update_process_glyph_fragments()/glyph_cache_fragment_put() in libfreerdp/cache/glyph.c. When handling a GLYPH_FRAGMENT_ADD update, the code reads a one-byte server-controlled declared fragment size but does not verify it fits within the remaining received buffer before allocating and copying that many bytes. A malicious RDP server can send a short fragment with an oversized declared size, causing the client to read beyond the allocated buffer, resulting in an out-of-bounds read and client crash.
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
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
FreeRDP 缓冲区错误漏洞
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 3.29.0之前版本存在缓冲区错误漏洞，该漏洞源于libfreerdp/cache/glyph.c文件中的update_process_glyph_fragments()/glyph_cache_fragment_put()函数在处理GLYPH_FRAGMENT_ADD更新时未验证声明片段大小是否适合接收缓冲区，可能导致恶意RDP服务器造成越界读取和客户端崩溃。
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 0 ~ 3.29.0 -

II. Public POCs for CVE-2026-67291

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 11298 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-67291

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Patches & Fixes for CVE-2026-67291 (1)

Vendor Advisories for CVE-2026-67291 (2)

Same Patch Batch · FreeRDP · 2026-08-01 · 21 CVEs total

CVE-2026-66402 9.8 CRITICAL FreeRDP before 3.29.0 TLS Certificate Identity Validation Bypass
CVE-2026-67289 9.8 CRITICAL FreeRDP before 3.29.0 HTTP Proxy Request Injection via Redirection
CVE-2026-67305 9.4 CRITICAL FreeRDP Windows Client before 3.29.0 Heap Buffer Overflow via Cliprdr
CVE-2026-67299 7.5 HIGH FreeRDP before 3.29.0 Use-After-Free via WindowIcon async message
CVE-2026-67304 7.5 HIGH FreeRDP before 3.29.0 NULL Dereference via smartcard cleanup
CVE-2026-67297 7.5 HIGH FreeRDP before 3.29.0 Resource Exhaustion via chunked HTTP response
CVE-2026-67301 7.5 HIGH FreeRDP before 3.29.0 Out-of-bounds Read via Polygon async message-proxy
CVE-2026-67290 7.5 HIGH FreeRDP before 3.29.0 Heap Out-of-Bounds Read via TSMF
CVE-2026-67296 7.5 HIGH FreeRDP before 3.29.0 Denial of Service via RDPEI PDU
CVE-2026-67300 7.5 HIGH FreeRDP before 3.29.0 Use-After-Free via async message proxy
CVE-2026-67288 7.5 HIGH FreeRDP before 3.29.0 Denial of Service via smartcard cache
CVE-2026-67298 7.5 HIGH FreeRDP 3.28.0 Heap Buffer Overflow via RAIL orderLength Underflow
CVE-2026-67292 6.5 MEDIUM FreeRDP before 3.29.0 WebSocket Ping Buffer Over-disclosure
CVE-2026-67295 6.3 MEDIUM FreeRDP before 3.29.0 Path Traversal via drive redirection
CVE-2026-67294 5.9 MEDIUM FreeRDP before 3.29.0 TLS Certificate EKU Bypass
CVE-2026-67306 5.4 MEDIUM FreeRDP before 3.29.0 Out-of-Bounds Read via Planar RLE
CVE-2026-67303 4.3 MEDIUM FreeRDP before 3.29.0 Denial of Service via serial DeviceControl
CVE-2026-67302 4.3 MEDIUM FreeRDP rdpecam StartStreamsRequest divide-by-zero denial of service
CVE-2026-67293 4.2 MEDIUM FreeRDP before 3.29.0 Improper Certificate Hostname Validation
CVE-2026-66401 2.1 LOW FreeRDP before 3.29.0 Out-of-Bounds Read via UVC H.264

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-67291

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