Deskflow: Odd-length DSOP options vector causes out-of-bounds read in Deskflow client

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-63409
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-17 21:16:46 UTC
Updated2026-08-18 16:18:12 UTC
DescriptionDeskflow 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.

Risk And Classification

Primary CVSS: v3.1 8.2 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

EPSS: 0.002580000 probability, percentile 0.176340000 (date 2026-08-18)

Problem Types: CWE-125 | CWE-125 CWE-125: Out-of-bounds Read

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
3.1CNADECLARED8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Deskflow Deskflow affected >= 1.17.0, < 1.26.0.296 Not specified

References

ReferenceSourceLinkTags
github.com/deskflow/deskflow/commit/8266fbbe6af93fa370018886c7f1f35d2cee... [email protected] github.com
github.com/deskflow/deskflow/security/advisories/GHSA-gmvh-3c73-m5gg 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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