CVE-2026-55564

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Source
https://cve.org/CVERecord?id=CVE-2026-55564
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-55564.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-55564
Aliases
  • GHSA-6xmj-pr98-cx4c
Downstream
Published
2026-08-19T17:45:47.438Z
Modified
2026-08-21T09:09:36.424945Z
Severity
  • 5.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L CVSS Calculator
Summary
FreeRDP: Out-of-bounds read in glyph_cache_get via crafted glyph fragments
Details

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, the glyphcacheget 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 GLYPHFRAGMENTUSE replay in updateprocessglyph_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.

Database specific 
{
    "cwe_ids": [
        "CWE-125",
        "CWE-193"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55564.json",
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/freerdp/freerdp

Affected ranges

Type
GIT
Repo
https://github.com/freerdp/freerdp
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
c29324750e3cbcba8761f147b7a5235cc686930f
Fixed
4f72b0979892352ff501e84d99832dc3bdc86a53
Database specific
Show details 
{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "3.27.0"
        }
    ]
}

Affected versions

1.*
1.0-beta1
1.0-beta2
1.0-beta4
1.0-beta5
1.0.0
1.0.1
1.1.0-beta+2013071101
1.1.0-beta1
1.1.0-beta1+android2
1.1.0-beta1+android3
1.1.0-beta1+android4
1.1.0-beta1+android5
1.1.0-beta1+ios1
1.1.0-beta1+ios2
1.1.0-beta1+ios3
1.1.0-beta1+ios4
1.2.0-beta1+android7
1.2.0-beta1+android9
2.*
2.0.0
2.0.0-beta1+android10
2.0.0-beta1+android11
2.0.0-rc0
2.0.0-rc1
2.0.0-rc2
2.0.0-rc3
2.0.0-rc4
3.*
3.0.0
3.0.0-beta1
3.0.0-beta2
3.0.0-beta3
3.0.0-beta4
3.0.0-rc0
3.1.0
3.2.0
3.3.0
3.4.0
3.5.0
3.5.1

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-55564.json"
vanir_signatures 
[
    {
        "signature_type": "Function",
        "source": "https://github.com/freerdp/freerdp/commit/c29324750e3cbcba8761f147b7a5235cc686930f",
        "deprecated": false,
        "digest": {
            "function_hash": "93036519385151388416460747969497365317",
            "length": 693.0
        },
        "target": {
            "function": "glyph_cache_get",
            "file": "libfreerdp/cache/glyph.c"
        },
        "id": "CVE-2026-55564-1f494f99",
        "signature_version": "v1"
    },
    {
        "signature_type": "Line",
        "source": "https://github.com/freerdp/freerdp/commit/c29324750e3cbcba8761f147b7a5235cc686930f",
        "deprecated": false,
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "52039373176474316678268215637408625998",
                "141700248064839750362390075249856480766",
                "9031375167578967402164386501519163610",
                "48234736490559715598760602149096335597"
            ]
        },
        "target": {
            "file": "libfreerdp/cache/glyph.c"
        },
        "id": "CVE-2026-55564-6ce52ff7",
        "signature_version": "v1"
    }
]
vanir_signatures_modified 
"2026-08-21T09:09:36Z"