CRITICAL

CVE-2026-22859

CVSS v3

9.1

CRITICAL

EPSS Score

0.9 %

exploit probability, as of 2026-10-18

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

freerdpAlmaLinux:10all versions · fixed in 2:3.10.3-5.el10_1.2and 5 other packages
freerdpAlmaLinux:9all versions · fixed in 2:2.11.7-1.el9_7.2and 4 other packages
freerdpAlmaLinux:8all versions · fixed in 2:2.11.7-3.el8_10and 4 other packages

Vendor advisories

CVE-2026-22859 Red Hat Product Security732 products fixed · 5 known affected
freerdp: FreeRDP heap-buffer-overflow
freerdp as a component of Red Hat Enterprise Linux 6 · freerdp-devel as a component of Red Hat Enterprise Linux 6 · freerdp-libs as a component of Red Hat Enterprise Linux 6
RHSA-2026:19033 Red Hat Product Security65 products fixed
Red Hat Security Advisory: freerdp security update
RHSA-2026:4489 Red Hat Product Security35 products fixed
Red Hat Security Advisory: freerdp security update
RHSA-2026:4471 Red Hat Product Security47 products fixed
Red Hat Security Advisory: freerdp security update
RHSA-2026:4446 Red Hat Product Security72 products fixed
Red Hat Security Advisory: freerdp security update
RHSA-2026:4440 Red Hat Product Security40 products fixed
Red Hat Security Advisory: freerdp security update

9 more advisories

Full record on NVD

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.

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Published: 2026-01-14
Last Modified: 2026-01-20

Frequently asked questions

What is CVE-2026-22859?

Is CVE-2026-22859 actively exploited?

Active exploitation of CVE-2026-22859 has not been confirmed. Its EPSS score was 0.9% on 2026-10-18, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-22859?

CVE-2026-22859 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

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