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Fencer Vulns
high 8.1

CVE-2026-22853 json

FreeRDP has a heap-buffer-overflow in ndr_read_uint8Array

published 2026-01-14 9 mo ago modified 2026-08-19 2 mo ago also EUVD-2026-2674

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits
0
none known

Summary

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.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 2:3.10.3-5.el10_1.2, 2:3.10.3-12.el10_2.2
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 2:3.10.3-3.el10_0.2
  • freerdp3 Debian 13 3.15.0+dfsg-2.1+deb13u1
  • freerdp3 Debian 14 3.20.2+dfsg-1

debian advisories DEBIAN-CVE-2026-22853

  • freerdp3 Ubuntu 25.10 3.16.0+dfsg-2ubuntu0.3

ubuntu advisories UBUNTU-CVE-2026-22853

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • freerdp RHEL 10.2 2:3.10.3-12.el10_2.2
  • libwinpr RHEL 10.2 2:3.10.3-12.el10_2.2
  • freerdp-libs RHEL 10.2 2:3.10.3-12.el10_2.2
  • freerdp-server RHEL 10.2 2:3.10.3-12.el10_2.2
  • freerdp RHEL 10.1 2:3.10.3-5.el10_1.2
  • libwinpr RHEL 10.1 2:3.10.3-5.el10_1.2
  • freerdp-libs RHEL 10.1 2:3.10.3-5.el10_1.2
  • freerdp-server RHEL 10.1 2:3.10.3-5.el10_1.2

red hat advisories RHSA-2026:19033RHSA-2026:4121RHSA-2026:3068

  • freerdp SLE Workstation Extension 15 SP7, SLE Module for Package Hub 15 SP7 3.10.3-150700.3.3.1

suse advisories SUSE-SU-2026:0345-1

  • freerdp openSUSE Leap 16.0 3.22.0-160000.1.1
  • freerdp openSUSE Tumbleweed 3.20.2-1.1

opensuse advisories openSUSE-SU-2026:20339-1openSUSE-SU-2026:10059-1

  • freerdp AlmaLinux 10 2:3.10.3-5.el10_1.2
  • libwinpr AlmaLinux 10 2:3.10.3-5.el10_1.2
  • freerdp-libs AlmaLinux 10 2:3.10.3-5.el10_1.2
  • freerdp-server AlmaLinux 10 2:3.10.3-5.el10_1.2

almalinux advisories ALSA-2026:3068

  • freerdp Rocky Linux 10 2:3.10.3-5.el10_1.2

rocky linux advisories RLSA-2026:3068

  • freerdp Alpine 3.23 3.22.0-r0

alpine advisories ALPINE-CVE-2026-22853

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-22853 updated cvss 8.1

freerdp: FreeRDP heap-buffer-overflow

  • Red Hat Enterprise Linux 6 freerdp, freerdp-libs, freerdp-plugins
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Linux AppStream (v. 10) freerdp 3.10.3-5.el10_1.2, freerdp 3.10.3-12.el10_2.2, libwinpr 3.10.3-5.el10_1.2, libwinpr 3.10.3-12.el10_2.2, freerdp-libs 3.10.3-5.el10_1.2, freerdp-libs 3.10.3-12.el10_2.2
    fixed: vendor fix RHSA-2026:3068
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) freerdp 3.10.3-3.el10_0.2, libwinpr 3.10.3-3.el10_0.2, freerdp-libs 3.10.3-3.el10_0.2
    fixed: vendor fix RHSA-2026:4121
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) freerdp-server 3.10.3-5.el10_1.2, freerdp-server 3.10.3-12.el10_2.2
    fixed: vendor fix RHSA-2026:3068
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) freerdp-server 3.10.3-3.el10_0.2
    fixed: vendor fix RHSA-2026:4121
  • Red Hat Enterprise Linux 7 freerdp, libwinpr, freerdp-libs, freerdp-plugins Red Hat Enterprise Linux 8 freerdp, libwinpr, freerdp-libs Red Hat Enterprise Linux 9 freerdp, libwinpr, freerdp-libs
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
9 mo ago

Exploit prediction

0.78% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-47v9-p4gp-w5ch referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 6.8 CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
CISA ADP 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 4.0 6.8 CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • FreeRDP FreeRDP
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.