How severe is CVE-2026-40254?

CVE-2026-40254 has a CVSS 3.x base score of 4.2, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-40254 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40254?

CVE-2026-40254 affects Freerdp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40254?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-40254 have an EU (EUVD) identifier?

Yes. CVE-2026-40254 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25381.

When was CVE-2026-40254 published?

CVE-2026-40254 was published on 2026-04-24 and last updated on 2026-06-17.

CVE-2026-40254

CVE-2026-40254 is a medium-severity vulnerability in Freerdp with a CVSS 3.x base score of 4.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-193.

Key facts

Severity: Medium (CVSS 3.x base score 4.2)
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-25381
Weakness: CWE-193
Affected product: Freerdp
Published: 2026-04-24
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-40254?: CVE-2026-40254 has a CVSS 3.x base score of 4.2, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-40254 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40254?: CVE-2026-40254 affects Freerdp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40254?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-40254 have an EU (EUVD) identifier?: Yes. CVE-2026-40254 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25381.
When was CVE-2026-40254 published?: CVE-2026-40254 was published on 2026-04-24 and last updated on 2026-06-17.

References

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3xpj-m4hx-8vmx

Affected products (1)

cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*

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