Medium 5.4Published Aug 19, 2026

CVE-2026-55564FreeRDP: Out-of-bounds read in glyph_cache_get via crafted glyph fragments

Updated under an hour ago (2026-10-19 07:23 UTC)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 5.4 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
Weakness (CWE): CWE-125, CWE-193
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Aug 25, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

FreeRDP FreeRDP freerdp:freerdp (from the name)	before 3.27.0	CNA record
freerdp freerdp freerdp:freerdp	before 3.27.0	NVD

References

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-6xmj-pr98-cx4cx-refsource-confirm, exploit, mitigation, vendor-advisory
https://github.com/FreeRDP/FreeRDP/pull/12885x-refsource-misc, issue-tracking, patch
https://github.com/FreeRDP/FreeRDP/commit/c29324750e3cbcba8761f147b7a5235cc686930fx-refsource-misc, patch
https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.0x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.