CVE-2026-68579 FreeRDP CVE debrief

Who should care

Users of FreeRDP versions before 3.30.0, administrators of systems with RDP access, and security teams responsible for patch management and vulnerability remediation should be aware of this vulnerability and take necessary actions to mitigate the risk.

Technical summary

The CliprdrStream_Read function in FreeRDP before version 3.30.0 has a heap-based buffer overflow vulnerability. The function improperly handles server-supplied lengths, allowing a malicious RDP server to execute arbitrary code on the client-side. This occurs when an OLE paste consumer, such as explorer.exe, calls IStream::Read with a fixed-size buffer. The CliprdrStream_Read function requests file contents from the RDP server and then copies the response into the caller's buffer using the server-supplied length (req_fsize) instead of the buffer size (cb). A malicious or compromised RDP server can return an oversized CB_FILECONTENTS_RESPONSE, causing an out-of-bounds write of attacker-controlled data into the paste consumer's heap buffer when a user pastes server-offered clipboard file contents. Users of FreeRDP versions before 3.30.0 should be aware of this vulnerability and take necessary actions to mitigate the risk. The vulnerability has a high CVSS score of 8.7, indicating a high severity level. The affected product deployments should be identified, and owners should be assigned for follow-up. Official advisories or CVE records should be reviewed to validate affected scope, severity, and vendor guidance. Vendor-supported updates or mitigations should be planned through normal change control where exposure is confirmed. Compensating controls for exposed systems should be reviewed while remediation is scheduled and verified. Relevant monitoring, detection, and logs for exposed assets should be checked for extra review. Exceptions should be tracked, and remediated assets should be retested, and the item should only be closed after evidence is documented. The CVE record and NVD entry provide details about the vulnerability, but the source detail is limited, and further verification is needed to confirm the affected scope and vendor remediation. The FreeRDP project has released a patch to address this vulnerability, and users are advised to apply the patch as soon as possible. Additionally, restricting access to RDP servers to trusted users only and monitoring clipboard contents for suspicious activity can help mitigate the risk. Implementing compensating, such,

Defensive priority

High-priority patching is recommended for systems using FreeRDP versions before 3.30.0 due to the high CVSS score of 8.7 and the potential for remote code execution.

Recommended defensive actions

• Apply patches or updates to FreeRDP to version 3.30.0 or later
• Restrict access to RDP servers to trusted users only
• Monitor clipboard contents for suspicious activity
• Implement compensating controls, such as network segmentation and intrusion detection
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and NVD entry provide details about the vulnerability. However, the source detail is limited, and further verification is needed to confirm the affected scope and vendor remediation. FreeRDP versions before 3.30.0 are affected, and users should verify their deployments, review official advisories, and plan updates through change control. Compensating controls and monitoring should be reviewed while remediation is scheduled.

Official resources