Out-of-bounds Read Affecting freerdp3 package, versions <3.27.0+dfsg-1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN14-FREERDP3-17882066
- published8 Jul 2026
- disclosed19 Aug 2026
Introduced: 8 Jul 2026
CVE-2026-55564 (opens in a new tab)How to fix?
Upgrade Debian:14 freerdp3 to version 3.27.0+dfsg-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream freerdp3 package and not the freerdp3 package as distributed by Debian.
See How to fix? for Debian:14 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.
References
- https://security-tracker.debian.org/tracker/CVE-2026-55564
- 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