Description
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.
Affected products
freerdp: freerdp
References5
- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-6xmj-pr98-c… ExploitMitigationVendor Advisory
- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-6xmj-pr98-c… ExploitMitigationVendor Advisory
- github.com/FreeRDP/FreeRDP/commit/c29324750e3cbcba8761f147b7a52… Patch
- github.com/FreeRDP/FreeRDP/pull/12885 Issue TrackingPatch
- github.com/FreeRDP/FreeRDP/releases/tag/3.27.0 Release Notes
Metrics
- CVSS 3.1
-
7.1
HIGH
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H - EPSS — exploit probability
- 0% percentile: 26 · as of 10 November 2026
- CWE
- CWE-125CWE-193
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