CRITICAL

CVE-2026-22853

CVSS v3

9.8

CRITICAL

EPSS Score

0.8 %

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

Vendor advisories

CVE-2026-22853 Red Hat Product Security195 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-2026:4121 Red Hat Product Security65 products fixed
Red Hat Security Advisory: freerdp security update
RHSA-2026:3068 Red Hat Product Security65 products fixed
Red Hat Security Advisory: freerdp security update

Full record on NVD

Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, RDPEAR’s NDR array reader does not perform bounds checking on the on‑wire element count and can write past the heap buffer allocated from hints, causing a heap buffer overflow in ndr_read_uint8Array. 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:H/A:H
Published: 2026-01-14
Last Modified: 2026-01-20

Frequently asked questions

What is CVE-2026-22853?

Is CVE-2026-22853 actively exploited?

Active exploitation of CVE-2026-22853 has not been confirmed. Its EPSS score was 0.8% on 2026-10-18, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-22853?

CVE-2026-22853 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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