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CVE-2026-55192— FreeRDP: Out-of-bounds read in H.264 YUV-to-RGB conversion due to decoder/surface dimension mismatch

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组织开源的一款远程桌面协议(RDP)的实现。 FreeRDP 3.27.0之前版本存在缓冲区错误漏洞，该漏洞源于H.264解码器后端返回的YUV平面尺寸未与RDPGFX表面尺寸进行比较，可能导致越界读取，从而泄露客户端内存或导致客户端崩溃。

CVSS 7.2 · High EPSS 0.52% · P42

Possible ATT&CK Techniques 1 AI

T1213 · Data from Information Repositories

Affected Version Matrix 1

VendorProduct Version RangeStatus
FreeRDP FreeRDP < 3.27.0 affected
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I. Basic Information for CVE-2026-55192

Vulnerability Information
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Vulnerability Title
FreeRDP: Out-of-bounds read in H.264 YUV-to-RGB conversion due to decoder/surface dimension mismatch
Source: CVE Program / CVE List V5
Vulnerability Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, FreeRDP H.264 decoder backends can return YUV planes sized from the bitstream without comparing the decoded width and height to the RDPGFX surface dimensions used to validate region rectangles. A malicious RDP server can provide an AVC420 or AVC444 bitstream whose decoded frame is smaller than the negotiated surface, causing yuv420_context_decode and the YUV-to-RGB conversion paths to read beyond the decoder-owned planes in libfreerdp/codec/h264.c and the selected H.264 backend. This can disclose client memory or crash the client. This issue is fixed in version 3.27.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N
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组织开源的一款远程桌面协议(RDP)的实现。 FreeRDP 3.27.0之前版本存在缓冲区错误漏洞，该漏洞源于H.264解码器后端返回的YUV平面尺寸未与RDPGFX表面尺寸进行比较，可能导致越界读取，从而泄露客户端内存或导致客户端崩溃。
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 < 3.27.0 -

II. Public POCs for CVE-2026-55192

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8198 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
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III. Intelligence Information for CVE-2026-55192

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Patches & Fixes for CVE-2026-55192 (1)

Vendor Advisories for CVE-2026-55192 (1)

Vendor Pages for CVE-2026-55192 (1)

Same Patch Batch · FreeRDP · 2026-08-19 · 9 CVEs total

CVE-2026-55191 8.7 HIGH FreeRDP: Heap-buffer-overflow write in AVC444 YUV buffer allocation
CVE-2026-55194 8.7 HIGH FreeRDPHeap-buffer-overflow write in TS Gateway RPC RESPONSE reassembly due to alloc_hint
CVE-2026-55193 8.7 HIGH FreeRDP: Heap-buffer-overflow write in TS Gateway RPC fragment receive due to uncapped bin
CVE-2026-63633 7.7 HIGH FreeRDP: Heap buffer overflow in Opus audio decode (`freerdp_dsp_decode_opus` resizes the
CVE-2026-63652 7.1 HIGH FreeRDP: Double-free of `client_formats` in the rdpsnd server channel on a malformed Clien
CVE-2026-63117 6.5 MEDIUM FreeRDP: Denial of service through ADPCM frame size calculation
CVE-2026-55648 6.1 MEDIUM FreeRDP: Integer Overflow in `freerdp_image_copy_from_icon_data` Bypasses Bounds Check
CVE-2026-55564 5.4 MEDIUM FreeRDP: Out-of-bounds read in glyph_cache_get via crafted glyph fragments

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-55192

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