CVE-2026-67299: FreeRDP before 3.29.0 contains a client-side heap use-after-free in the async update message proxy for WINDOW_

Q: How do I fix CVE-2026-67299?

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

Q: Is CVE-2026-67299 being exploited?

CVE-2026-67299 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-2026-67299 affect?

CVE-2026-67299 affects freerdp. Severity is high (CVSS 7.5). FreeRDP before 3.29.0 contains a client-side heap use-after-free in the async update message proxy for WINDOW_ICON_ORDER when AsyncUpdate is enabled (e.g. xfreerdp /async-update). In update_message_WindowIcon() a shallow CopyMemory() overwr

Q: How urgent is CVE-2026-67299?

Priority 45/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-67299 is a high-severity flaw (CVSS 7.5) affecting freerdp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

FreeRDP before 3.29.0 contains a client-side heap use-after-free in the async update message proxy for WINDOW_ICON_ORDER when AsyncUpdate is enabled (e.g. xfreerdp /async-update). In update_message_WindowIcon() a shallow CopyMemory() overwrites a freshly allocated lParam->iconInfo with the parser-owned windowIcon->iconInfo pointer. After the parser callback returns, update_recv_window_info_order() frees window_icon.iconInfo, but the queued async

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 66%)
CISA exploited list	No
Weakness	CWE-416
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 13:16 UTCPublished CVE record published
2026-09-08 14:32 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-2026-67299?

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

Is CVE-2026-67299 being exploited?

CVE-2026-67299 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-2026-67299 affect?

CVE-2026-67299 affects freerdp. Severity is high (CVSS 7.5). FreeRDP before 3.29.0 contains a client-side heap use-after-free in the async update message proxy for WINDOW_ICON_ORDER when AsyncUpdate is enabled (e.g. xfreerdp /async-update). In update_message_WindowIcon() a shallow CopyMemory() overwr

How urgent is CVE-2026-67299?

Priority 45/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

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References

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