CVE-2026-55193

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-55193
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-55193.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-55193
Aliases
  • GHSA-7rp4-66mc-j9vx
Downstream
Related
Published
2026-08-19T17:46:39.233Z
Modified
2026-08-22T10:47:46.549249Z
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 TS Gateway RPC fragment receive due to uncapped bind_ack max_xmit_frag
Details

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, FreeRDP clients using TS Gateway accept a server-controlled maxxmitfrag value in libfreerdp/core/gateway/rpcbind.c without bounding it to the 4088-byte ReceiveFragment allocation. A malicious gateway can advertise 65535 and then send a response fragment of the same length, causing rpcchannel_read in libfreerdp/core/gateway/rpc.c to write up to 65535 bytes into the smaller ReceiveFragment buffer. This can crash the client and may permit code execution through attacker-controlled heap corruption. This issue is fixed in version 3.27.0.

Database specific 
{
    "cwe_ids": [
        "CWE-122"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55193.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
a863ef1cf1cdabf9019280e5658f806e73bb50e8
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-2026-55193.json"
vanir_signatures 
[
    {
        "signature_type": "Line",
        "source": "https://github.com/freerdp/freerdp/commit/a863ef1cf1cdabf9019280e5658f806e73bb50e8",
        "deprecated": false,
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "89498076570549038054820839601572047331",
                "215522716250580204425442577755748005515",
                "179948923025444307034318410708490098313"
            ]
        },
        "target": {
            "file": "libfreerdp/core/gateway/rpc_bind.c"
        },
        "id": "CVE-2026-55193-01e3c0b8",
        "signature_version": "v1"
    },
    {
        "signature_type": "Function",
        "source": "https://github.com/freerdp/freerdp/commit/a863ef1cf1cdabf9019280e5658f806e73bb50e8",
        "deprecated": false,
        "digest": {
            "function_hash": "154363947889425953628178337097873855346",
            "length": 1118.0
        },
        "target": {
            "function": "rpc_recv_bind_ack_pdu",
            "file": "libfreerdp/core/gateway/rpc_bind.c"
        },
        "id": "CVE-2026-55193-8da41c59",
        "signature_version": "v1"
    }
]
vanir_signatures_modified 
"2026-08-22T10:47:46Z"