CVE-2026-63409Public exploitNetwork attack vector

Client crash via odd-length DSOP vector

Published Aug 17, 2026 · Updated Aug 18, 2026

Out-of-bounds read in Deskflow before 1.26.0.296 allows remote attackers to crash a connected client via a malformed DSOP message. In src/lib/client/ServerProxy.cpp, ServerProxy::setOptions() consumes DSOP entries as key/value pairs and steps by two without validating even-length input, so a trailing key triggers an out-of-range read of the missing value slot. Successful exploitation requires a client handshake with a malicious or compromised Deskflow server and results in a client crash; public evidence shows denial of service only.

CVSS severity8.2
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Deskflow before 1.26.0.296 allows remote attackers to crash a connected client via a malformed DSOP message. In src/lib/client/ServerProxy.cpp, ServerProxy::setOptions() consumes DSOP entries as key/value pairs and steps by two without validating even-length input, so a trailing key triggers an out-of-range read of the missing value slot. Successful exploitation requires a client handshake with a malicious or compromised Deskflow server and results in a client crash; public evidence shows denial of service only.

The record

CVE
CVE-2026-63409
Published
Aug 17, 2026
Updated
Aug 18, 2026
Vendor
Deskflow
Product
Deskflow
Classifications
CWE-125, CAPEC-540, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 1.17.0, < 1.26.0.296

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Deskflow · Deskflowversion=>= 1.17.0, < 1.26.0.296

Published CVSS scores

8.2GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
CAPEC-540Overread Buffers
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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