CVE-2026-55564

highpriority · track · 28EPSS 0.003 · 26 %ileDERUUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.33% (26th) EPSS
CVSS 7.1 · high
Is it mine?
18 products
Check your exposure
Who says so?
3 sources
fstec_bdu · cert_bund · nvd

EPSS · scored 2026-10-28

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.

01

cvss

Technical severity, 0–10. One row per scoring source.

7.1
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.4–7.1

v3.17.1highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:Hprimary · NVD / NIST USexploitability 2.8 · impact 4.2
v3.15.4mediumAV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:Lsecondary · FSTEC (BDU) RU
v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:Lsecondary · security-advisories@github.comexploitability 2.8 · impact 2.5
v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)
02

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: poc · Automatable: no · Technical Impact: partialcoordinatorcisa_ssvcUS
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-125USCWE-125USCWE-193USCWE-193US
04

affected products (18)

Products and version ranges known to be affected.

05

advisories (1)

Vendor and ecosystem advisories describing this.

  • WID-SEC-W-2026-1933FreeRDP: Mehrere SchwachstellenDeutsch2026-06-15csaf · cert_bundDE

    Ein Angreifer kann mehrere Schwachstellen in FreeRDP ausnutzen,um nicht näher spezifizierte Auswirkungen zu verursachen, potenziell beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, Daten zu manipulieren, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand zu verursachen.

06

also known as (2)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

fstec_bducert_bundnvdNVDCVE.orgMITRE
published 2026-08-19modified 2026-10-26
08

references (4) nvd

External citations — patches, advisories, analysis.

scry

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