CVE-2026-40254 Vulnerability Analysis & Exploit Details

CVE-2026-40254
Vulnerability Scoring

4.2
/10
Medium Risk

The vulnerability CVE-2026-40254 could compromise system integrity but typically requires user interaction to be exploited.

Attack Complexity Details

  • Attack Complexity: High
    Exploits require significant effort and special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: None
    No privileges are required for exploitation.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: Required
    User interaction is necessary for successful exploitation.

CVE-2026-40254 Details

Status: Analyzed

Last updated: 🕠 27 Apr 2026, 17:44 UTC
Originally published on: 🕒 24 Apr 2026, 03:16 UTC

Time between publication and last update: 3 days

CVSS Release: version 3

CVSS3 Source

security-advisories@github.com

CVSS3 Type

Secondary

CVSS3 Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

CVE-2026-40254 Vulnerability Summary

CVE-2026-40254: FreeRDP is a free implementation of the Remote Desktop Protocol. Versions prior to 3.25.0 have an off-by-one in the path traversal filter in `channels/drive/client/drive_file.c`. The `contains_dotdot()` function catches `../` and `..\` mid-path but misses `..` when it's the last component with no trailing separator. A rogue RDP server can read, list, or write files one directory above the client's shared folder through RDPDR requests. This requires the victim to connect with drive redirection enabled. Version 3.25.0 patches the issue.

Assessing the Risk of CVE-2026-40254

Access Complexity Graph

The exploitability of CVE-2026-40254 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-40254

CVE-2026-40254 presents a challenge to exploit due to its high attack complexity, but the absence of privilege requirements still makes it a viable target for skilled attackers. A thorough security review is advised.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-40254, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-40254, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: Low
    CVE-2026-40254 could lead to minor leaks of non-critical information without major privacy breaches.
  • Integrity: Low
    Exploiting CVE-2026-40254 may cause minor changes to data without severely impacting its accuracy.
  • Availability: None
    CVE-2026-40254 does not impact system availability.

CVE-2026-40254 References

External References

CWE Common Weakness Enumeration

CWE-193

Vulnerable Configurations

  • cpe:2.3:a:freerdp:freerdp:-:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:-:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:1.0.0:-:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:1.0.0:-:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:1.0.0:beta1:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:1.0.0:beta1:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:1.0.0:beta2:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:1.0.0:beta2:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:1.0.0:beta3:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:1.0.0:beta3:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:1.0.0:beta4:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:1.0.0:beta4:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:1.0.0:beta5:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:1.0.0:beta5:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:1.0.1:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:1.0.1:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:1.0.2:-:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:1.0.2:-:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:1.0.2:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:1.0.2:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:1.0.2:rc1:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:1.0.2:rc1:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:1.0.2:rc2:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:1.0.2:rc2:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:1.1.0:-:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:1.1.0:-:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:1.1.0:beta1:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:1.1.0:beta1:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:1.1.0:beta2:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:1.1.0:beta2:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:1.2.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:1.2.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.0.0:-:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.0.0:-:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.0.0:rc0:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.0.0:rc0:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.0.0:rc1:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.0.0:rc1:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.0.0:rc2:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.0.0:rc2:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.0.0:rc3:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.0.0:rc3:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.0.0:rc4:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.0.0:rc4:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.0.0:beta1:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.0.0:beta1:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.1.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.1.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.1.1:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.1.1:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.1.2:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.1.2:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.2.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.2.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.3.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.3.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.3.1:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.3.1:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.3.2:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.3.2:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.4.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.4.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.4.1:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.4.1:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.5.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.5.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.6.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.6.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.6.1:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.6.1:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.7.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.7.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.8.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.8.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.8.1:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.8.1:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.9.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.9.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.10.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.10.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.11.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.11.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.11.1:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.11.1:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.11.2:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.11.2:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.11.3:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.11.3:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.11.4:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.11.4:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.11.5:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.11.5:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.11.6:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.11.6:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.11.7:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.11.7:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:2.11.8:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:2.11.8:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.0.0:-:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.0.0:-:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.0.0:rc0:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.0.0:rc0:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.0.0:beta1:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.0.0:beta1:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.0.0:beta2:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.0.0:beta2:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.0.0:beta3:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.0.0:beta3:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.0.0:beta4:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.0.0:beta4:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.1.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.1.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.2.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.2.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.3.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.3.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.4.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.4.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.5.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.5.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.5.1:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.5.1:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.6.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.6.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.6.1:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.6.1:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.6.2:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.6.2:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.6.3:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.6.3:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.7.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.7.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.8.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.8.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.9.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.9.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.10.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.10.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.10.1:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.10.1:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.10.2:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.10.2:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.10.3:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.10.3:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.11.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.11.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.11.1:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.11.1:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.12.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.12.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.13.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.13.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.14.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.14.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.14.1:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.14.1:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.15.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.15.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.16.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.16.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.17.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.17.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.17.1:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.17.1:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.17.2:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.17.2:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.18.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.18.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.19.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.19.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.19.1:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.19.1:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.20.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.20.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.20.1:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.20.1:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.20.2:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.20.2:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.21.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.21.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.22.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.22.0:*:*:*:*:*:*:*
  • cpe:2.3:a:freerdp:freerdp:3.23.0:*:*:*:*:*:*:*
    cpe:2.3:a:freerdp:freerdp:3.23.0:*:*:*:*:*:*:*

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