{"apiVersion":"1.0","identifier":"CVE-2026-55564","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.","publishedAt":"2026-08-19T18:16:45","lastModifiedAt":"2026-08-25T04:18:12","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55564","cvssScore":5.4,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L","epssProbability":0.00266,"riskScore":0.55,"affectedProduct":"FreeRDP","affectedVersions":"<3.27.0","vulnerabilityType":"Library","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-55564","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-55564","en":"https://www.redsauce.net/en/cves/CVE-2026-55564","fr":"https://www.redsauce.net/fr/cves/CVE-2026-55564","pt":"https://www.redsauce.net/pt/cves/CVE-2026-55564","de":"https://www.redsauce.net/de/cves/CVE-2026-55564","sk":"https://www.redsauce.net/sk/cves/CVE-2026-55564","el":"https://www.redsauce.net/el/cves/CVE-2026-55564"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-55564"}}