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Fencer Vulns
high 7.1

CVE-2026-33987 json

FreeRDP: Persistent Cache bmpSize Desync - Heap OOB Write

published 2026-03-30 7 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-17235

cvss
7.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in persistent_cache_read_entry_v3() in libfreerdp/cache/persistent.c, persistent->bmpSize is updated before winpr_aligned_recalloc(). If realloc fails, bmpSize is inflated while bmpData points to the old buffer. This issue has been patched in version 3.24.2.

Patch / fix

  • freerdp freerdp 3.24.2
  • freerdp3 Debian 13 3.15.0+dfsg-2.1+deb13u2
  • freerdp3 Debian 14 3.24.2+dfsg-1

debian advisories DEBIAN-CVE-2026-33987

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

ubuntu advisories UBUNTU-CVE-2026-33987

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_2.5
  • libwinpr RHEL 10.2 2:3.10.3-12.el10_2.5
  • freerdp-libs RHEL 10.2 2:3.10.3-12.el10_2.5
  • freerdp-server RHEL 10.2 2:3.10.3-12.el10_2.5
  • freerdp RHEL 10.1 2:3.10.3-5.el10_1.8
  • libwinpr RHEL 10.1 2:3.10.3-5.el10_1.8
  • freerdp-libs RHEL 10.1 2:3.10.3-5.el10_1.8
  • freerdp-server RHEL 10.1 2:3.10.3-5.el10_1.8

red hat advisories RHSA-2026:20605RHSA-2026:19142RHSA-2026:16014

  • freerdp SLE Workstation Extension 15 SP7, SLE Module for Package Hub 15 SP7 3.10.3-150700.3.17.1
  • freerdp SLES for SAP applications 16.0, SLES 16.0 3.26.0-160000.1.1

suse advisories SUSE-SU-2026:3562-1SUSE-SU-2026:22194-1

  • freerdp openSUSE Leap 16.0 3.26.0-160000.1.1
  • freerdp openSUSE Tumbleweed 3.24.2-1.1

opensuse advisories openSUSE-SU-2026:21116-1openSUSE-SU-2026:10633-1

  • freerdp AlmaLinux 10 2:3.10.3-5.el10_1.8
  • libwinpr AlmaLinux 10 2:3.10.3-5.el10_1.8
  • freerdp-libs AlmaLinux 10 2:3.10.3-5.el10_1.8
  • freerdp-server AlmaLinux 10 2:3.10.3-5.el10_1.8

almalinux advisories ALSA-2026:16014

  • freerdp Rocky Linux 10 2:3.10.3-12.el10_2.5
  • freerdp Rocky Linux 10 2:3.10.3-5.el10_1.8

rocky linux advisories RLSA-2026:19142RLSA-2026:16014

  • freerdp Alpine 3.24, Alpine 3.23 3.24.2-r0

alpine advisories ALPINE-CVE-2026-33987

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-2026-33987 updated cvss 7.8

FreeRDP: FreeRDP: Memory corruption vulnerability allows denial of service or arbitrary code execution

  • 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_1.8, freerdp 3.10.3-12.el10_2.5, libwinpr 3.10.3-5.el10_1.8, libwinpr 3.10.3-12.el10_2.5, freerdp-libs 3.10.3-5.el10_1.8, freerdp-libs 3.10.3-12.el10_2.5
    fixed: vendor fix RHSA-2026:16014
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) freerdp 3.10.3-3.el10_0.7, libwinpr 3.10.3-3.el10_0.7, freerdp-libs 3.10.3-3.el10_0.7
    fixed: vendor fix RHSA-2026:20605
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) freerdp-server 3.10.3-5.el10_1.8, freerdp-server 3.10.3-12.el10_2.5
    fixed: vendor fix RHSA-2026:16014
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) freerdp-server 3.10.3-3.el10_0.7
    fixed: vendor fix RHSA-2026:20605
  • 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
none
Automatable
no
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.10% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
NVD 3.1 6.6 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H

Affected products

  • FreeRDP FreeRDP

Classification

Weakness
  • CWE-122 Heap-based Buffer Overflow
  • CWE-131 Incorrect Calculation of Buffer Size

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.