CVE-2026-55564
FreeRDP is a free implementation of the Remote Desktop Protocol.
Does this matter?
Lower severity and a low EPSS score (0.33%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.4 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
- EPSS
- 0.33% probability · 27th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-125, CWE-193
- Source
- security-advisories@github.com
References
- https://github.com/FreeRDP/FreeRDP/commit/c29324750e3cbcba8761f147b7a5235cc686930f
- https://github.com/FreeRDP/FreeRDP/pull/12885
- https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.0
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-6xmj-pr98-cx4c
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-6xmj-pr98-cx4c
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.