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Out-of-bounds Read Affecting freerdp-server package, versions <2:3.6.3-1.amzn2023.0.13

Severity

 Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.37% (31st percentile)

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  • Snyk IDSNYK-AMZN2023-FREERDPSERVER-18530172
  • published5 Aug 2026
  • disclosed19 Aug 2026
Report a new vulnerability Found a mistake?

Introduced: 5 Aug 2026

NewCVE-2026-55564  (opens in a new tab)
CWE-125  (opens in a new tab)
CWE-193  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 freerdp-server to version 2:3.6.3-1.amzn2023.0.13 or higher.
This issue was patched in ALAS2023-2026-2012.

NVD Description

Note: Versions mentioned in the description apply only to the upstream freerdp-server package and not the freerdp-server package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

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.