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Fencer Vulns
high 8.8

CVE-2026-26965 json

FreeRDP has Out-of-bounds Write

published 2026-02-25 8 mo ago modified 2026-07-15 3 mo ago also EUVD-2026-8740

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits
0
none known

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, in the RLE planar decode path, `planar_decompress_plane_rle()` writes into `pDstData` at `((nYDst+y) * nDstStep) + (4*nXDst) + nChannel` without verifying that `(nYDst+nSrcHeight)` fits in the destination height or that `(nXDst+nSrcWidth)` fits in the destination stride. When `TempFormat != DstFormat`, `pDstData` becomes `planar->pTempData` (sized for the desktop), while `nYDst` is only validated against the **surface** by `is_within_surface()`. A malicious RDP server can exploit this to perform a heap out-of-bounds write with attacker-controlled offset and pixel data on any connecting FreeRDP client. The OOB write reaches up to 132,096 bytes past the temp buffer end, and on the brk heap (desktop ≤ 128×128), an adjacent `NSC_CONTEXT` struct's `decode` function pointer is overwritten with attacker-controlled pixel data — control-flow–relevant corruption (function pointer overwritten) demonstrated under deterministic heap layout (`nsc->decode = 0xFF414141FF414141`). Version 3.23.0 fixes the vulnerability.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 2:3.10.3-5.el10_1.3, 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_0.3
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:2.1.1-5.el7_9.5
  • Red Hat Red Hat Enterprise Linux 8 2:2.11.7-4.el8_10
  • Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support 2:2.0.0-46.rc4.el8_2.8
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 2:2.2.0-10.el8_4
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 2:2.2.0-10.el8_4
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 2:2.2.0-7.el8_6.3
  • Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service 2:2.2.0-7.el8_6.3
  • Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions 2:2.2.0-7.el8_6.3
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 2:2.2.0-12.el8_8.3
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 2:2.2.0-12.el8_8.3
  • Red Hat Red Hat Enterprise Linux 9 2:2.11.7-1.el9_7.3
  • Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions 2:2.4.1-3.el9_0.2
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 2:2.4.1-6.el9_2.4
  • Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support 2:2.11.2-1.el9_4.3
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 2:2.11.7-1.el9_6.5
  • freerdp3 Debian 13 3.15.0+dfsg-2.1+deb13u1
  • freerdp3 Debian 14 3.23.0+dfsg-1

debian advisories DEBIAN-CVE-2026-26965

  • freerdp3 Ubuntu 24.04 LTS 3.5.1+dfsg1-0ubuntu1.4
  • freerdp3 Ubuntu 25.10 3.16.0+dfsg-2ubuntu0.3

ubuntu advisories UBUNTU-CVE-2026-26965

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 9 2:2.11.7-1.el9_7.3
  • libwinpr RHEL 9 2:2.11.7-1.el9_7.3
  • freerdp-libs RHEL 9 2:2.11.7-1.el9_7.3
  • freerdp RHEL 8 2:2.11.7-4.el8_10

red hat advisories RHSA-2026:19033RHSA-2026:7292RHSA-2026:6764RHSA-2026:6712RHSA-2026:6665RHSA-2026:6616

  • freerdp SLE Workstation Extension 15 SP7, SLE Module for Package Hub 15 SP7 3.10.3-150700.3.9.1
  • freerdp2 SLE Workstation Extension 15 SP7, SLE Module for Package Hub 15 SP7 2.11.7-150700.3.14.1
  • freerdp SLE Module for Package Hub 15 SP7, openSUSE Leap 15.6 2.11.2-150600.4.18.1
  • freerdp SLE Module for Package Hub 15 SP7 2.4.0-150400.3.47.1
  • freerdp SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 2.1.2-12.63.1

suse advisories SUSE-SU-2026:1398-1SUSE-SU-2026:1165-1SUSE-SU-2026:1164-1SUSE-SU-2026:1160-1SUSE-SU-2026:1129-1

  • freerdp2 openSUSE Tumbleweed 2.11.7-6.1
  • freerdp openSUSE Tumbleweed 3.24.1-1.1

opensuse advisories openSUSE-SU-2026:10459-1openSUSE-SU-2026:10408-1

  • freerdp AlmaLinux 9 2:2.11.7-1.el9_7.3
  • libwinpr AlmaLinux 9 2:2.11.7-1.el9_7.3
  • freerdp-libs AlmaLinux 9 2:2.11.7-1.el9_7.3
  • freerdp AlmaLinux 8 2:2.11.7-4.el8_10
  • libwinpr AlmaLinux 8 2:2.11.7-4.el8_10
  • freerdp-libs AlmaLinux 8 2:2.11.7-4.el8_10
  • freerdp AlmaLinux 10 2:3.10.3-5.el10_1.3
  • libwinpr AlmaLinux 10 2:3.10.3-5.el10_1.3

almalinux advisories ALSA-2026:6004ALSA-2026:6005ALSA-2026:5939

  • freerdp Rocky Linux 8 2:2.11.7-4.el8_10

rocky linux advisories RLSA-2026:6005

  • freerdp Alpine 3.24, Alpine 3.23 3.23.0-r0

alpine advisories ALPINE-CVE-2026-26965

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-2026-26965 updated cvss 8.8

freerdp: FreeRDP: Arbitrary code execution via heap out-of-bounds write in RLE planar decode path

  • Red Hat CodeReady Linux Builder EUS (v.9.4) freerdp-devel 2.11.2-1.el9_4.3, libwinpr-devel 2.11.2-1.el9_4.3, freerdp-debuginfo 2.11.2-1.el9_4.3, libwinpr-debuginfo 2.11.2-1.el9_4.3, freerdp-debugsource 2.11.2-1.el9_4.3, freerdp-libs-debuginfo 2.11.2-1.el9_4.3
    fixed: vendor fix RHSA-2026:6384
  • Red Hat CodeReady Linux Builder EUS (v.9.6) freerdp-devel 2.11.7-1.el9_6.5, libwinpr-devel 2.11.7-1.el9_6.5, freerdp-debuginfo 2.11.7-1.el9_6.5, libwinpr-debuginfo 2.11.7-1.el9_6.5, freerdp-debugsource 2.11.7-1.el9_6.5, freerdp-libs-debuginfo 2.11.7-1.el9_6.5
    fixed: vendor fix RHSA-2026:6385
  • Red Hat Enterprise Linux AppStream (v. 8) freerdp 2.11.7-4.el8_10, libwinpr 2.11.7-4.el8_10, freerdp-libs 2.11.7-4.el8_10
    fixed: vendor fix RHSA-2026:6005
  • Red Hat Enterprise Linux AppStream (v. 9) freerdp 2.11.7-1.el9_7.3, libwinpr 2.11.7-1.el9_7.3, freerdp-libs 2.11.7-1.el9_7.3
    fixed: vendor fix RHSA-2026:6004
  • Red Hat Enterprise Linux AppStream (v. 10) freerdp 3.10.3-5.el10_1.3, freerdp 3.10.3-12.el10_2.2, libwinpr 3.10.3-5.el10_1.3, libwinpr 3.10.3-12.el10_2.2, freerdp-libs 3.10.3-5.el10_1.3, freerdp-libs 3.10.3-12.el10_2.2
    fixed: vendor fix RHSA-2026:5939
  • Red Hat Enterprise Linux AppStream AUS (v. 8.2) freerdp 2.0.0-46.rc4.el8_2.8, libwinpr 2.0.0-46.rc4.el8_2.8, freerdp-libs 2.0.0-46.rc4.el8_2.8
    fixed: vendor fix RHSA-2026:6712
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) freerdp 2.2.0-10.el8_4, libwinpr 2.2.0-10.el8_4, freerdp-libs 2.2.0-10.el8_4
    fixed: vendor fix RHSA-2026:6616
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) freerdp 2.2.0-7.el8_6.3, libwinpr 2.2.0-7.el8_6.3, freerdp-libs 2.2.0-7.el8_6.3 Red Hat Enterprise Linux AppStream E4S (v.8.6) freerdp 2.2.0-7.el8_6.3, libwinpr 2.2.0-7.el8_6.3, freerdp-libs 2.2.0-7.el8_6.3
    fixed: vendor fix RHSA-2026:6665
show 15 more
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) freerdp 2.2.0-12.el8_8.3, libwinpr 2.2.0-12.el8_8.3, freerdp-libs 2.2.0-12.el8_8.3
    fixed: vendor fix RHSA-2026:6764
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) freerdp 2.4.1-3.el9_0.2, libwinpr 2.4.1-3.el9_0.2, freerdp-libs 2.4.1-3.el9_0.2
    fixed: vendor fix RHSA-2026:6395
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) freerdp 2.4.1-6.el9_2.4, libwinpr 2.4.1-6.el9_2.4, freerdp-libs 2.4.1-6.el9_2.4
    fixed: vendor fix RHSA-2026:6396
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) freerdp 3.10.3-3.el10_0.3, libwinpr 3.10.3-3.el10_0.3, freerdp-libs 3.10.3-3.el10_0.3
    fixed: vendor fix RHSA-2026:5936
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) freerdp 2.11.2-1.el9_4.3, libwinpr 2.11.2-1.el9_4.3, freerdp-libs 2.11.2-1.el9_4.3
    fixed: vendor fix RHSA-2026:6384
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) freerdp 2.11.7-1.el9_6.5, libwinpr 2.11.7-1.el9_6.5, freerdp-libs 2.11.7-1.el9_6.5
    fixed: vendor fix RHSA-2026:6385
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) freerdp 2.2.0-10.el8_4, libwinpr 2.2.0-10.el8_4, freerdp-libs 2.2.0-10.el8_4
    fixed: vendor fix RHSA-2026:6616
  • Red Hat Enterprise Linux AppStream TUS (v.8.6) freerdp 2.2.0-7.el8_6.3, libwinpr 2.2.0-7.el8_6.3, freerdp-libs 2.2.0-7.el8_6.3
    fixed: vendor fix RHSA-2026:6665
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) freerdp 2.2.0-12.el8_8.3, libwinpr 2.2.0-12.el8_8.3, freerdp-libs 2.2.0-12.el8_8.3
    fixed: vendor fix RHSA-2026:6764
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) freerdp-devel 2.11.7-1.el9_7.3, libwinpr-devel 2.11.7-1.el9_7.3, freerdp-debuginfo 2.11.7-1.el9_7.3, libwinpr-debuginfo 2.11.7-1.el9_7.3, freerdp-debugsource 2.11.7-1.el9_7.3, freerdp-libs-debuginfo 2.11.7-1.el9_7.3
    fixed: vendor fix RHSA-2026:6004
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) freerdp-server 3.10.3-5.el10_1.3, freerdp-server 3.10.3-12.el10_2.2
    fixed: vendor fix RHSA-2026:5939
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) freerdp-server 3.10.3-3.el10_0.3
    fixed: vendor fix RHSA-2026:5936
  • Red Hat Enterprise Linux CRB (v. 8) freerdp-devel 2.11.7-4.el8_10, freerdp-debuginfo 2.11.7-4.el8_10, libwinpr-debuginfo 2.11.7-4.el8_10, freerdp-debugsource 2.11.7-4.el8_10, freerdp-libs-debuginfo 2.11.7-4.el8_10
    fixed: vendor fix RHSA-2026:6005
  • Red Hat Enterprise Linux Server (v. 7 ELS) freerdp 2.1.1-5.el7_9.5, libwinpr 2.1.1-5.el7_9.5, freerdp-libs 2.1.1-5.el7_9.5 Red Hat Enterprise Linux Server Optional (v. 7 ELS) freerdp-devel 2.1.1-5.el7_9.5, libwinpr-devel 2.1.1-5.el7_9.5, freerdp-debuginfo 2.1.1-5.el7_9.5
    fixed: vendor fix RHSA-2026:7292
  • Red Hat Enterprise Linux 6 freerdp, freerdp-libs, freerdp-plugins
    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
8 mo ago

Exploit prediction

0.69% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-5vgf-mw4f-r33h referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CISA ADP 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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 7 Extended Lifecycle Support
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 6

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.