CVE-2026-67299Network attack vectorHinoki check available

Client crash via stale WindowIcon pointer

Published Aug 1, 2026 · Updated Aug 1, 2026

Heap use-after-free in FreeRDP before 3.29.0 allows remote attackers controlling an RDP server to crash a client via a crafted icon order. update_message_WindowIcon() shallow-copies the order over a new structure, replacing its allocated iconInfo with the parser-owned pointer that is freed before queued dispatch. The client must connect with AsyncUpdate enabled; the demonstrated consequence is memory corruption and a client crash, not code execution.

CVSS severity6.5
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Heap use-after-free in FreeRDP before 3.29.0 allows remote attackers controlling an RDP server to crash a client via a crafted icon order. update_message_WindowIcon() shallow-copies the order over a new structure, replacing its allocated iconInfo with the parser-owned pointer that is freed before queued dispatch. The client must connect with AsyncUpdate enabled; the demonstrated consequence is memory corruption and a client crash, not code execution.

The record

CVE
CVE-2026-67299
Published
Aug 1, 2026
Updated
Aug 1, 2026
Vendor
FreeRDP
Product
FreeRDP
Classifications
CWE-416, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 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 <3.29.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FreeRDP · FreeRDPversion=0 <3.29.0

Published CVSS scores

6.5Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
7.5CVE.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499.004Application or System Exploitation

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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