Dashboard / CVE-2026-55564

CVE-2026-55564

HIGH
MEDIUM Priority: 0.02 BB Relevance: 64/100
Published: 2026-08-19 Modified: 2026-10-26 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Auth

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: Required
S: Unchanged
C: Low
I: None
A: High

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.

Weakness Classification (2)

Affected Software (1)

VendorProductVersion
freerdp freerdp < 3.27.0

References & Advisories (4)

Bug Bounty Relevance

64 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity

CVSS Score

7.1 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

EPSS — Exploitation Probability

0.33%
Raw Score 0.003280
Percentile 25.8%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00328
2026-10-28
0.00328

Intelligence Sources

nvd ref →

External Links