CVE-2026-67305: FreeRDP Windows client before 3.29.0 contains a heap buffer overflow vulnerability in the clipboard virtual ch

Q: How do I fix CVE-2026-67305?

freerdp: upgrade to 3.29.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-67305 being exploited?

CVE-2026-67305 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-67305 affect?

CVE-2026-67305 affects freerdp. Severity is high (CVSS 8.8). FreeRDP Windows client before 3.29.0 contains a heap buffer overflow vulnerability in the clipboard virtual channel when processing CLIPRDR_FILE_CONTENTS_RESPONSE PDUs without validating the server-provided size against the destination buff

Q: How urgent is CVE-2026-67305?

Priority 50/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2026-67305 is a high-severity flaw (CVSS 8.8) affecting freerdp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

FreeRDP Windows client before 3.29.0 contains a heap buffer overflow vulnerability in the clipboard virtual channel when processing CLIPRDR_FILE_CONTENTS_RESPONSE PDUs without validating the server-provided size against the destination buffer. A malicious RDP server can send a response with a data payload significantly larger than requested, causing arbitrary heap memory corruption that may enable remote code execution when a user performs a past

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 45%)
CISA exploited list	No
Weakness	CWE-122
Published	2026-08-01
Last modified	2026-09-08

Publisher (CNA): VulnCheck · Vendor: freerdp

Last updated 2026-09-08 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-01 13:17 UTCPublished CVE record published
2026-09-08 14:04 UTCUpdated Record last modified

freerdp freerdp UPGRADE

Affected: < 3.29.0

Fixed in: 3.29.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy freerdp || rpm -q freerdp || freerdp --version

2. UPGRADE to 3.29.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade freerdp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade freerdp

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-67305?

freerdp: upgrade to 3.29.0. Exact commands for each OS are on this page.

Is CVE-2026-67305 being exploited?

CVE-2026-67305 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-67305 affect?

CVE-2026-67305 affects freerdp. Severity is high (CVSS 8.8). FreeRDP Windows client before 3.29.0 contains a heap buffer overflow vulnerability in the clipboard virtual channel when processing CLIPRDR_FILE_CONTENTS_RESPONSE PDUs without validating the server-provided size against the destination buff

How urgent is CVE-2026-67305?

Priority 50/100. High severity; Public exploit reference

Software pages

Windows vulnerabilities · WinRM and RDP vulnerabilities

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References

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