FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, the glyph_cache_get function in libfreerdp/cache/glyph.c checks whether index is greater than cache->number instead of greater than or equal to it. A malicious RDP server can use GLYPH_FRAGMENT_USE replay in update_process_glyph_fragments to make the default cache receive index 254 when cache->number is 254, reading one pointer beyond the entries array and dereferencing it as a glyph. This can crash the client and may disclose adjacent heap data. This issue is fixed in version 3.27.0.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade freerdpUpgrade freerdp-develUpgrade libwinpr-develUpgrade freerdp-debuginfoUpgrade libwinprUpgrade freerdp-libs | Aug 5, 2026 | Aug 5, 2026 |
| Redhat_linux | — | No solution exists | Aug 26, 2026 | Aug 19, 2026 |
| Ubuntu | — | Upgrade libfreerdp3-3Upgrade freerdp-x11Upgrade freerdp3-x11 | Jul 21, 2026 | Jul 20, 2026 |
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