CVE-2026-68579Network attack vector

Heap corruption via unchecked clipboard response copy

Published Aug 2, 2026 · Updated Aug 2, 2026

Heap-based buffer overflow in FreeRDP before 3.30.0 allows remote attackers to corrupt a Windows paste consumer's heap via clipboard data. CliprdrStream_Read requests cb bytes but CopyMemory writes req_fsize bytes from the server's CB_FILECONTENTS_RESPONSE into the caller's cb-byte buffer. Exploitation requires a Windows client to connect to a malicious or compromised RDP server and a user to paste server-offered file content, enabling a crash or code execution in the paste consumer.

CVSS severity8.7
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in FreeRDP before 3.30.0 allows remote attackers to corrupt a Windows paste consumer's heap via clipboard data. CliprdrStream_Read requests cb bytes but CopyMemory writes req_fsize bytes from the server's CB_FILECONTENTS_RESPONSE into the caller's cb-byte buffer. Exploitation requires a Windows client to connect to a malicious or compromised RDP server and a user to paste server-offered file content, enabling a crash or code execution in the paste consumer.

The record

CVE
CVE-2026-68579
Published
Aug 2, 2026
Updated
Aug 2, 2026
Vendor
FreeRDP
Product
FreeRDP
Classifications
CWE-787, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=0 <3.30.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FreeRDP · FreeRDPversion=0 <3.30.0

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
9.6VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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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