Bug 2519813 (CVE-2026-55564) - CVE-2026-55564 FreeRDP: FreeRDP: Out-of-bounds read in glyph cache leads to denial of service and information disclosure
Summary: CVE-2026-55564 FreeRDP: FreeRDP: Out-of-bounds read in glyph cache leads to d...
Keywords:
Status: NEW
Alias: CVE-2026-55564
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2521941 2521943 2521945
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-19 17:56 UTC by OSIDB Bzimport
Modified: 2026-08-24 14:06 UTC (History)
2 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-08-19 17:56:42 UTC 
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.
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