CVE-2026-63409

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Source
https://cve.org/CVERecord?id=CVE-2026-63409
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63409.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-63409
Aliases
  • GHSA-gmvh-3c73-m5gg
Downstream
Published
2026-08-17T20:57:19.326Z
Modified
2026-08-20T10:17:20.788636Z
Severity
  • 8.2 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H CVSS Calculator
Summary
Deskflow: Odd-length DSOP options vector causes out-of-bounds read in Deskflow client
Details

Deskflow is a keyboard and mouse sharing app. From 1.17.0 until continuous build 1.26.0.296, a malicious Deskflow server can send an odd-length DSOP vector to ServerProxy::setOptions() in src/lib/client/ServerProxy.cpp, causing the missing value after the final option key to be read beyond the vector during the PacketStreamFilter::filterEvent to ServerProxy::handleData() to ServerProxy::parseHandshakeMessage() call chain and crash the connected client. This issue is fixed in continuous build 1.26.0.296.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63409.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "introduced": "1.17.0"
                },
                {
                    "fixed": "1.26.0.296"
                }
            ],
            "source": "AFFECTED_FIELD"
        }
    ],
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-125"
    ]
}
References

Affected packages

Git / github.com/deskflow/deskflow

Affected ranges

Type
GIT
Repo
https://github.com/deskflow/deskflow
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
8266fbbe6af93fa370018886c7f1f35d2cee8b3f
Database specific
Show details 
{
    "source": "REFERENCES"
}

Affected versions

v1.*
v1.17.0
v1.17.1
v1.17.2
v1.18.0
v1.19.0
v1.20.0
v1.20.1
v1.21.0
v1.21.1
v1.21.2
v1.22.0
v1.23.0
v1.24.0
v1.25.0
v1.26.0

Database specific

vanir_signatures_modified 
"2026-08-20T10:17:20Z"
vanir_signatures 
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        "target": {
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        },
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        "digest": {
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        "signature_type": "Line",
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    },
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        "id": "CVE-2026-63409-11dad1d3",
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    },
    {
        "id": "CVE-2026-63409-40e33c37",
        "target": {
            "file": "src/lib/deskflow/Screen.cpp"
        },
        "signature_version": "v1",
        "digest": {
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        "target": {
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            "function": "XWindowsScreen::setOptions"
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        "target": {
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            "function": "ServerProxy::setOptions"
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        "signature_version": "v1",
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        "source": "https://github.com/deskflow/deskflow/commit/8266fbbe6af93fa370018886c7f1f35d2cee8b3f"
    },
    {
        "id": "CVE-2026-63409-7d19d0e5",
        "target": {
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            "function": "Client::setOptions"
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        "signature_version": "v1",
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    },
    {
        "id": "CVE-2026-63409-929b8799",
        "target": {
            "file": "src/lib/server/ClientProxy1_0.cpp",
            "function": "ClientProxy1_0::setOptions"
        },
        "signature_version": "v1",
        "digest": {
            "length": 541.0,
            "function_hash": "104530485550888798731996742964881974822"
        },
        "signature_type": "Function",
        "deprecated": false,
        "source": "https://github.com/deskflow/deskflow/commit/8266fbbe6af93fa370018886c7f1f35d2cee8b3f"
    },
    {
        "id": "CVE-2026-63409-a61be1d9",
        "target": {
            "file": "src/lib/deskflow/Screen.cpp",
            "function": "Screen::setOptions"
        },
        "signature_version": "v1",
        "digest": {
            "length": 1080.0,
            "function_hash": "18947052360808800384892180812294548188"
        },
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        "deprecated": false,
        "source": "https://github.com/deskflow/deskflow/commit/8266fbbe6af93fa370018886c7f1f35d2cee8b3f"
    },
    {
        "id": "CVE-2026-63409-aa93e63b",
        "target": {
            "file": "src/lib/platform/XWindowsScreen.cpp"
        },
        "signature_version": "v1",
        "digest": {
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]
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63409.json"