FreeRDP up to 3.28.0 Glyph Cache libfreerdp/cache/glyph.c out-of-bounds

Summaryinfo

A vulnerability, which was classified as critical, has been found in FreeRDP up to 3.28.0. Affected by this vulnerability is the function update_process_glyph_fragments/glyph_cache_fragment_put of the file libfreerdp/cache/glyph.c of the component Glyph Cache. The manipulation leads to out-of-bounds. This vulnerability is listed as CVE-2026-67291. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in FreeRDP up to 3.28.0. It has been rated as critical. This issue affects the function update_process_glyph_fragments/glyph_cache_fragment_put of the file libfreerdp/cache/glyph.c of the component Glyph Cache. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-67291 since 07/29/2026. The exploitation is known to be easy. The attack may be initiated remotely. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

Upgrading to version 3.29.0 eliminates this vulnerability.

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Productinfo

Type

• Remote Access Software

Name

• FreeRDP

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12
• 3.13
• 3.14
• 3.15
• 3.16
• 3.17
• 3.18
• 3.19
• 3.20
• 3.21
• 3.22
• 3.23
• 3.24
• 3.25
• 3.26
• 3.27
• 3.28.0

License

• open-source

Website

• Product: https://github.com/FreeRDP/FreeRDP/

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