CVE-2026-55191

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Source
https://cve.org/CVERecord?id=CVE-2026-55191
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-55191.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-55191
Aliases
  • GHSA-vx73-w5q6-7jqr
Downstream
Related
Published
2026-08-19T17:44:52.392Z
Modified
2026-08-21T09:09:36.135455Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
FreeRDP: Heap-buffer-overflow write in AVC444 YUV buffer allocation
Details

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, FreeRDP clients that negotiate RDPGFX AVC444 with an H.264 decoder backend calculate the intermediate YUV444 allocation size in libfreerdp/codec/h264.c with 32-bit multiplication in avc444ensurebuffer. A malicious RDP server can supply surface dimensions for which piDstStride multiplied by padDstHeight wraps to a small nonzero value, causing winpralignedrecalloc to allocate an undersized buffer before YUV420CombineToYUV444 writes using the actual stride and rectangle dimensions. This can cause a client crash and may permit code execution through attacker-influenced heap corruption. This issue is fixed in version 3.27.0.

Database specific 
{
    "cwe_ids": [
        "CWE-122",
        "CWE-190"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55191.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
97f40b9e766af375f4e41ac6a3f4397d708d249c
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-2026-55191.json"
vanir_signatures 
[
    {
        "signature_type": "Line",
        "source": "https://github.com/freerdp/freerdp/commit/97f40b9e766af375f4e41ac6a3f4397d708d249c",
        "deprecated": false,
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "48174095235466160751121575708509728262",
                "11144820776453550293254840977539219724",
                "274401937115262867876596987545089614917",
                "186272877945233000668693540578688413252",
                "187565802453358020320230546053045453683",
                "33817876480808945754884006534388078729",
                "277059941125427303465452712062411898515",
                "115157482681376152684946011057980634619",
                "321490431307320095629976707404843296055",
                "224435050257559175890767996891601908376"
            ]
        },
        "target": {
            "file": "libfreerdp/codec/h264.c"
        },
        "id": "CVE-2026-55191-3b9508c3",
        "signature_version": "v1"
    },
    {
        "signature_type": "Function",
        "source": "https://github.com/freerdp/freerdp/commit/97f40b9e766af375f4e41ac6a3f4397d708d249c",
        "deprecated": false,
        "digest": {
            "function_hash": "57696007405446287005638493369776229418",
            "length": 1302.0
        },
        "target": {
            "function": "avc444_ensure_buffer",
            "file": "libfreerdp/codec/h264.c"
        },
        "id": "CVE-2026-55191-596acca0",
        "signature_version": "v1"
    }
]
vanir_signatures_modified 
"2026-08-21T09:09:36Z"