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Fencer Vulns
medium 5.3

CVE-2026-27951 json

FreeRDP has possible Integer overflow in Stream_EnsureCapacity

published 2026-02-25 8 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-8755

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits
0
none known

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, the function `Stream_EnsureCapacity` can create an endless blocking loop. This may affect all client and server implementations using `FreeRDP`. For practical exploitation this will only work on 32bit systems where the available physical memory is `>= SIZE_MAX`. Version 3.23.0 contains a patch. No known workarounds are available.

Patch / fix

  • freerdp freerdp 3.23.0
  • freerdp3 Debian 14 3.23.0+dfsg-1

debian advisories DEBIAN-CVE-2026-27951

  • freerdp3 Ubuntu 24.04 LTS 3.30.0+dfsg-0ubuntu0.24.04.1

ubuntu advisories UBUNTU-CVE-2026-27951

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 9 2:2.11.7-7.el9_8.3
  • libwinpr RHEL 9 2:2.11.7-7.el9_8.3
  • freerdp-libs RHEL 9 2:2.11.7-7.el9_8.3
  • freerdp RHEL 9 2:2.11.7-1.el9_7.7
  • libwinpr RHEL 9 2:2.11.7-1.el9_7.7
  • freerdp-libs RHEL 9 2:2.11.7-1.el9_7.7
  • freerdp RHEL 8 2:2.11.7-9.el8_10
  • libwinpr RHEL 8 2:2.11.7-9.el8_10

red hat advisories RHSA-2026:20546RHSA-2026:19811RHSA-2026:19358RHSA-2026:16866RHSA-2026:16865RHSA-2026:16814

  • freerdp SLE Workstation Extension 15 SP7, SLE Module for Package Hub 15 SP7 3.10.3-150700.3.17.1

suse advisories SUSE-SU-2026:3562-1

  • freerdp2 openSUSE Tumbleweed 2.11.7-8.1

opensuse advisories openSUSE-SU-2026:10611-1

  • freerdp AlmaLinux 9 2:2.11.7-7.el9_8.3
  • libwinpr AlmaLinux 9 2:2.11.7-7.el9_8.3
  • freerdp-libs AlmaLinux 9 2:2.11.7-7.el9_8.3
  • freerdp AlmaLinux 9 2:2.11.7-1.el9_7.7
  • libwinpr AlmaLinux 9 2:2.11.7-1.el9_7.7
  • freerdp-libs AlmaLinux 9 2:2.11.7-1.el9_7.7
  • freerdp AlmaLinux 8 2:2.11.7-9.el8_10
  • libwinpr AlmaLinux 8 2:2.11.7-9.el8_10

almalinux advisories ALSA-2026:19358ALSA-2026:16482ALSA-2026:16019

  • freerdp Rocky Linux 9 2:2.11.7-7.el9_8.3
  • freerdp Rocky Linux 9 2:2.11.7-1.el9_7.7
  • freerdp Rocky Linux 8 2:2.11.7-9.el8_10

rocky linux advisories RLSA-2026:19358RLSA-2026:16482RLSA-2026:16019

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-2026-27951 updated cvss 5.9

freerdp: FreeRDP: Denial of Service via endless blocking loop in Stream_EnsureCapacity

  • Red Hat Enterprise Linux 6 freerdp, freerdp-libs, freerdp-plugins
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Linux 10 freerdp
    affected: workaround, no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.4) freerdp-devel 2.11.2-1.el9_4.8, libwinpr-devel 2.11.2-1.el9_4.8, freerdp-debuginfo 2.11.2-1.el9_4.8, libwinpr-debuginfo 2.11.2-1.el9_4.8, freerdp-debugsource 2.11.2-1.el9_4.8, freerdp-libs-debuginfo 2.11.2-1.el9_4.8
    fixed: vendor fix RHSA-2026:16866
  • Red Hat CodeReady Linux Builder EUS (v.9.6) freerdp-devel 2.11.7-1.el9_6.10, libwinpr-devel 2.11.7-1.el9_6.10, freerdp-debuginfo 2.11.7-1.el9_6.10, libwinpr-debuginfo 2.11.7-1.el9_6.10, freerdp-debugsource 2.11.7-1.el9_6.10, freerdp-libs-debuginfo 2.11.7-1.el9_6.10
    fixed: vendor fix RHSA-2026:16865
  • Red Hat Enterprise Linux AppStream (v. 8) freerdp 2.11.7-9.el8_10, libwinpr 2.11.7-9.el8_10, freerdp-libs 2.11.7-9.el8_10
    fixed: vendor fix RHSA-2026:16019
  • Red Hat Enterprise Linux AppStream (v. 9) freerdp 2.11.7-1.el9_7.7, freerdp 2.11.7-7.el9_8.3, libwinpr 2.11.7-1.el9_7.7, libwinpr 2.11.7-7.el9_8.3, freerdp-libs 2.11.7-1.el9_7.7, freerdp-libs 2.11.7-7.el9_8.3
    fixed: vendor fix RHSA-2026:16482
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) freerdp 2.2.0-14.el8_4, libwinpr 2.2.0-14.el8_4, freerdp-libs 2.2.0-14.el8_4
    fixed: vendor fix RHSA-2026:19811
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) freerdp 2.2.0-7.el8_6.8, libwinpr 2.2.0-7.el8_6.8, freerdp-libs 2.2.0-7.el8_6.8 Red Hat Enterprise Linux AppStream E4S (v.8.6) freerdp 2.2.0-7.el8_6.8, libwinpr 2.2.0-7.el8_6.8, freerdp-libs 2.2.0-7.el8_6.8
    fixed: vendor fix RHSA-2026:16814
show 11 more
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) freerdp 2.2.0-12.el8_8.8, libwinpr 2.2.0-12.el8_8.8, freerdp-libs 2.2.0-12.el8_8.8
    fixed: vendor fix RHSA-2026:16777
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) freerdp 2.4.1-3.el9_0.7, libwinpr 2.4.1-3.el9_0.7, freerdp-libs 2.4.1-3.el9_0.7
    fixed: vendor fix RHSA-2026:16485
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) freerdp 2.4.1-6.el9_2.9, libwinpr 2.4.1-6.el9_2.9, freerdp-libs 2.4.1-6.el9_2.9
    fixed: vendor fix RHSA-2026:16483
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) freerdp 2.11.2-1.el9_4.8, libwinpr 2.11.2-1.el9_4.8, freerdp-libs 2.11.2-1.el9_4.8
    fixed: vendor fix RHSA-2026:16866
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) freerdp 2.11.7-1.el9_6.10, libwinpr 2.11.7-1.el9_6.10, freerdp-libs 2.11.7-1.el9_6.10
    fixed: vendor fix RHSA-2026:16865
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) freerdp 2.2.0-14.el8_4, libwinpr 2.2.0-14.el8_4, freerdp-libs 2.2.0-14.el8_4
    fixed: vendor fix RHSA-2026:19811
  • Red Hat Enterprise Linux AppStream TUS (v.8.6) freerdp 2.2.0-7.el8_6.8, libwinpr 2.2.0-7.el8_6.8, freerdp-libs 2.2.0-7.el8_6.8
    fixed: vendor fix RHSA-2026:16814
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) freerdp 2.2.0-12.el8_8.8, libwinpr 2.2.0-12.el8_8.8, freerdp-libs 2.2.0-12.el8_8.8
    fixed: vendor fix RHSA-2026:16777
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) freerdp-devel 2.11.7-1.el9_7.7, freerdp-devel 2.11.7-7.el9_8.3, libwinpr-devel 2.11.7-1.el9_7.7, libwinpr-devel 2.11.7-7.el9_8.3, freerdp-debuginfo 2.11.7-1.el9_7.7, freerdp-debuginfo 2.11.7-7.el9_8.3, +6 more
    fixed: vendor fix RHSA-2026:16482
  • Red Hat Enterprise Linux CRB (v. 8) freerdp-devel 2.11.7-9.el8_10, freerdp-debuginfo 2.11.7-9.el8_10, libwinpr-debuginfo 2.11.7-9.el8_10, freerdp-debugsource 2.11.7-9.el8_10, freerdp-libs-debuginfo 2.11.7-9.el8_10
    fixed: vendor fix RHSA-2026:16019
  • Red Hat Enterprise Linux Server (v. 7 ELS) freerdp 2.1.1-5.el7_9.9, libwinpr 2.1.1-5.el7_9.9, freerdp-libs 2.1.1-5.el7_9.9 Red Hat Enterprise Linux Server Optional (v. 7 ELS) freerdp-devel 2.1.1-5.el7_9.9, libwinpr-devel 2.1.1-5.el7_9.9, freerdp-debuginfo 2.1.1-5.el7_9.9
    fixed: vendor fix RHSA-2026:20546

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
yes
Technical impact
partial
Assessed
8 mo ago

Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-qcfc-ghxr-h927 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • FreeRDP FreeRDP

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

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.