CVE-2026-67296Network attack vectorHinoki check available

Service interruption via oversized RDPEI body allocation

Published Aug 1, 2026 · Updated Aug 1, 2026

Improper input validation in FreeRDP before 3.29.0 allows remote attackers to interrupt RDP services via a crafted RDPEI message. rdpei_server_handle_messages subtracts the header size from a peer-controlled 32-bit pduLen and passes the result to Stream_EnsureCapacity without an upper bound or receipt of the declared body. Exposure requires a server, proxy, or shadow deployment with RDPEI reachable; the confirmed consequence is excessive server-side memory consumption, not code execution or data access.

CVSS severity8.7
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper input validation in FreeRDP before 3.29.0 allows remote attackers to interrupt RDP services via a crafted RDPEI message. rdpei_server_handle_messages subtracts the header size from a peer-controlled 32-bit pduLen and passes the result to Stream_EnsureCapacity without an upper bound or receipt of the declared body. Exposure requires a server, proxy, or shadow deployment with RDPEI reachable; the confirmed consequence is excessive server-side memory consumption, not code execution or data access.

The record

CVE
CVE-2026-67296
Published
Aug 1, 2026
Updated
Aug 1, 2026
Vendor
FreeRDP
Product
FreeRDP
Classifications
CWE-20, T1499.003
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

7.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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

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.

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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-20Improper Input Validation
T1499.003Application Exhaustion Flood

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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