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Vulnerability · Published May 29, 2026 · Assigned by GitHub_M

CVE-2026-45700Heap-buffer-overflow write in planar bitmap decoder

High 8.8

In plain English

A high-severity out-of-bounds write in FreeRDP from FreeRDP. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 6.1% (higher than 93% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)6.1%top 6.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, FreeRDP's planar bitmap decoder has an out-of-bounds heap write when decoding RLE planar data. In libfreerdp/codec/planar.c, freerdp_bitmap_decompress_planar() validates the X destination coordinate nXDst against the caller-provided destination stride (nDstStep) even when it is writing into the internal temp buffer pTempData. An attacker can bypass the check with a large nDstStep and a large nXDst, causing planar_decompress_plane_rle() to write past the end of pTempData. This vulnerability is fixed in 3.26.0.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10freerdp2:3.10.3-12.el10_2.6ALSA-2026:36203
AlmaLinux:8freerdp2:2.11.7-10.el8_10ALSA-2026:38501
AlmaLinux:9freerdp2:2.11.7-7.el9_8.4ALSA-2026:37207
AlmaLinux:10freerdp-devel2:3.10.3-12.el10_2.6ALSA-2026:36203
AlmaLinux:8freerdp-devel2:2.11.7-10.el8_10ALSA-2026:38501
AlmaLinux:9freerdp-devel2:2.11.7-7.el9_8.4ALSA-2026:37207
AlmaLinux:10freerdp-libs2:3.10.3-12.el10_2.6ALSA-2026:36203
AlmaLinux:8freerdp-libs2:2.11.7-10.el8_10ALSA-2026:38501
AlmaLinux:9freerdp-libs2:2.11.7-7.el9_8.4ALSA-2026:37207
AlmaLinux:10freerdp-server2:3.10.3-12.el10_2.6ALSA-2026:36203
AlmaLinux:10libwinpr2:3.10.3-12.el10_2.6ALSA-2026:36203
AlmaLinux:8libwinpr2:2.11.7-10.el8_10ALSA-2026:38501
AlmaLinux:9libwinpr2:2.11.7-7.el9_8.4ALSA-2026:37207
AlmaLinux:10libwinpr-devel2:3.10.3-12.el10_2.6ALSA-2026:36203
AlmaLinux:8libwinpr-devel2:2.11.7-10.el8_10ALSA-2026:38501
AlmaLinux:9libwinpr-devel2:2.11.7-7.el9_8.4ALSA-2026:37207
Debian:12freerdp2no fix listedDEBIAN-CVE-2026-45700
Debian:13freerdp3no fix listedDEBIAN-CVE-2026-45700
Debian:14freerdp33.26.0+dfsg-1DEBIAN-CVE-2026-45700
Rocky Linux:10freerdp2:3.10.3-12.el10_2.6RLSA-2026:36203
Rocky Linux:8freerdp2:2.11.7-10.el8_10RLSA-2026:38501
Rocky Linux:9freerdp2:2.11.7-7.el9_8.4RLSA-2026:37207
Ubuntu:22.04:LTSfreerdp22.6.1+dfsg1-3ubuntu2.11UBUNTU-CVE-2026-45700
Ubuntu:24.04:LTSfreerdp33.5.1+dfsg1-0ubuntu1.6UBUNTU-CVE-2026-45700
Ubuntu:25.10freerdp33.16.0+dfsg-2ubuntu0.5UBUNTU-CVE-2026-45700
Ubuntu:26.04:LTSfreerdp33.24.2+dfsg-1ubuntu1.1UBUNTU-CVE-2026-45700

Affected products (as reported)

VendorProductVersions
FreeRDP FreeRDP < 3.26.0

Weakness: CWE-787 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References