CVE-2026-40254Public exploitNetwork attack vector

Client file read and write via path traversal

Published Apr 24, 2026 · Updated Apr 24, 2026

Path traversal in FreeRDP before 3.25.0 allows remote attackers controlling an RDP server to read or write client files via RDPDR. The contains_dotdot() check in channels/drive/client/drive_file.c uses a strict end-bound comparison, so a terminal .. component bypasses filtering. Exploitation requires a victim to connect to the server with drive redirection enabled and exposes files one directory above the shared-drive root.

CVSS severity4.2
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in FreeRDP before 3.25.0 allows remote attackers controlling an RDP server to read or write client files via RDPDR. The contains_dotdot() check in channels/drive/client/drive_file.c uses a strict end-bound comparison, so a terminal .. component bypasses filtering. Exploitation requires a victim to connect to the server with drive redirection enabled and exposes files one directory above the shared-drive root.

The record

CVE
CVE-2026-40254
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
FreeRDP
Product
FreeRDP
Classifications
CWE-193, T1105, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.25.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FreeRDP · FreeRDPversion=< 3.25.0

Published CVSS scores

4.2GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitPublished

Weakness, pattern, technique

CWE-193Off-by-one Error
T1105Ingress Tool Transfer
T1005Data from Local System

Public exploit references

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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