How severe is CVE-2026-22859?

CVE-2026-22859 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.

Is CVE-2026-22859 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-22859?

CVE-2026-22859 affects Freerdp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-22859?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-22859 have an EU (EUVD) identifier?

Yes. CVE-2026-22859 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2668.

When was CVE-2026-22859 published?

CVE-2026-22859 was published on 2026-01-14 and last updated on 2026-06-30.

CVE-2026-22859

CVE-2026-22859 is a critical-severity vulnerability in Freerdp with a CVSS 3.x base score of 9.1. 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-125.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v4: 5.6
EPSS exploit prediction: 1% (51st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-2668
Weakness: CWE-125
Affected product: Freerdp
Published: 2026-01-14
Last modified: 2026-06-30

Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, the URBDRC client does not perform bounds checking on server‑supplied MSUSB_INTERFACE_DESCRIPTOR values and uses them as indices in libusb_udev_complete_msconfig_setup, causing an out‑of‑bounds read. This vulnerability is fixed in 3.20.1.

Frequently asked questions

What is CVE-2026-22859?: FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, the URBDRC client does not perform bounds checking on server‑supplied MSUSB_INTERFACE_DESCRIPTOR values and uses them as indices in libusb_udev_complete_msconfig_setup, causing an out‑of‑bounds read. This vulnerability is fixed in 3.20.1.
How severe is CVE-2026-22859?: CVE-2026-22859 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.
Is CVE-2026-22859 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-22859?: CVE-2026-22859 affects Freerdp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-22859?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-22859 have an EU (EUVD) identifier?: Yes. CVE-2026-22859 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2668.
When was CVE-2026-22859 published?: CVE-2026-22859 was published on 2026-01-14 and last updated on 2026-06-30.

References

Affected products (1)

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

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