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CVE-2026-55564
5.4 MEDIUM
- CVSS version (CVSS): 3.1
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): Low (L)
- Privileges Required (PR): None (N)
- User Interaction (UI): Required (R)
- Scope (S): Unchanged (U)
- Confidentiality (C): Low (L)
- Integrity (I): None (N)
- Availability (A): Low (L)
- Modified Attack Vector (MAV): Network (N)
- Modified Attack Complexity (MAC): Low (L)
- Modified Privileges Required (MPR): None (N)
- Modified User Interaction (MUI): Required (R)
- Modified Confidentiality (MC): Low (L)
- Modified Scope (MS): Unchanged (U)
- Modified Integrity (MI): None (N)
- Modified Availability (MA): Low (L)
Activity log
- Created suggestion
FreeRDP: Out-of-bounds read in glyph_cache_get via crafted glyph fragments
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
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https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-6xmj-pr98-cx4c x_refsource_CONFIRM
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https://github.com/FreeRDP/FreeRDP/pull/12885 x_refsource_MISC
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https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.0 x_refsource_MISC
Affected products
FreeRDP
- ==< 3.27.0
Package maintainers
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@cizra Elmo Todurov <todurov+nix@gmail.com>
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@DeimElias Deim Elias <deimelias@gmail.com>