CVE-2026-23534 json
FreeRDP has heap-buffer-overflow in clear_decompress_bands_data
published 2026-01-19 9 mo ago modified 2026-07-15 3 mo ago also EUVD-2026-3314
- cvss
- 7.6
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 45%
- public exploits
- 0
- none known
Summary
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, a client-side heap buffer overflow occurs in the ClearCodec bands decode path when crafted band coordinates allow writes past the end of the destination surface buffer. A malicious server can trigger a client‑side heap buffer overflow, causing a crash (DoS) and potential heap corruption with code‑execution risk depending on allocator behavior and surrounding heap layout. Version 3.21.0 contains a patch for the issue.
Patch / fix
- Red Hat Red Hat Enterprise Linux 10 2:3.10.3-5.el10_1.1
- Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 2:3.10.3-3.el10_0.1
- Red Hat Red Hat Enterprise Linux 8 2:2.11.7-2.el8_10
- Red Hat Red Hat Enterprise Linux 9 2:2.11.7-1.el9_7.1
- Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support 2:2.11.2-1.el9_4.1
- Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 2:2.11.7-1.el9_6.1
- freerdp3 Debian 13 3.15.0+dfsg-2.1+deb13u1
- freerdp3 Debian 14 3.21.0+dfsg-1
debian advisories DEBIAN-CVE-2026-23534
- freerdp2 Ubuntu 22.04 LTS 2.6.1+dfsg1-3ubuntu2.8
- freerdp3 Ubuntu 24.04 LTS 3.5.1+dfsg1-0ubuntu1.4
- freerdp3 Ubuntu 25.10 3.16.0+dfsg-2ubuntu0.3
- freerdp2 Ubuntu Pro 18.04 LTS 2.2.0+dfsg1-0ubuntu0.18.04.4+esm3
- freerdp2 Ubuntu Pro 20.04 LTS 2.6.1+dfsg1-0ubuntu0.20.04.2+esm1
- freerdp2 Ubuntu Pro 24.04 LTS 2.11.5+dfsg1-1ubuntu0.1~esm3
ubuntu advisories UBUNTU-CVE-2026-23534
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 10.1 2:3.10.3-5.el10_1.1
- libwinpr RHEL 10.1 2:3.10.3-5.el10_1.1
- freerdp-libs RHEL 10.1 2:3.10.3-5.el10_1.1
- freerdp-server RHEL 10.1 2:3.10.3-5.el10_1.1
- freerdp RHEL 8 2:2.11.7-2.el8_10
- libwinpr RHEL 8 2:2.11.7-2.el8_10
- freerdp-libs RHEL 8 2:2.11.7-2.el8_10
- freerdp RHEL 9 2:2.11.7-1.el9_7.1
red hat advisories RHSA-2026:3037RHSA-2026:2952RHSA-2026:2736RHSA-2026:2222RHSA-2026:2081RHSA-2026:2048
- freerdp2 SLE Workstation Extension 15 SP7, SLE Module for Package Hub 15 SP7 2.11.7-150700.3.3.1
- freerdp SLE Module for Package Hub 15 SP7 2.4.0-150400.3.35.1
- freerdp SLE Module for Package Hub 15 SP7, openSUSE Leap 15.6 2.11.2-150600.4.6.1
- freerdp SLE Workstation Extension 15 SP7, SLE Module for Package Hub 15 SP7 3.10.3-150700.3.3.1
- freerdp SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 2.1.2-12.52.1
suse advisories SUSE-SU-2026:0559-1SUSE-SU-2026:0449-1SUSE-SU-2026:0421-1SUSE-SU-2026:0417-1SUSE-SU-2026:0345-1
- freerdp openSUSE Leap 16.0 3.22.0-160000.1.1
- freerdp2 openSUSE Leap 16.0 2.11.7-bp160.2.1
- freerdp2 openSUSE Tumbleweed 2.11.7-4.1
- freerdp openSUSE Tumbleweed 3.21.0-1.1
opensuse advisories openSUSE-SU-2026:20339-1openSUSE-SU-2026:20320-1openSUSE-SU-2026:10176-1openSUSE-SU-2026:10107-1
- freerdp AlmaLinux 10 2:3.10.3-5.el10_1.1
- libwinpr AlmaLinux 10 2:3.10.3-5.el10_1.1
- freerdp-libs AlmaLinux 10 2:3.10.3-5.el10_1.1
- freerdp-server AlmaLinux 10 2:3.10.3-5.el10_1.1
- freerdp AlmaLinux 9 2:2.11.7-1.el9_7.1
- libwinpr AlmaLinux 9 2:2.11.7-1.el9_7.1
- freerdp-libs AlmaLinux 9 2:2.11.7-1.el9_7.1
- freerdp AlmaLinux 8 2:2.11.7-2.el8_10
almalinux advisories ALSA-2026:2222ALSA-2026:2048ALSA-2026:2081
- freerdp Rocky Linux 10 2:3.10.3-5.el10_1.1
- freerdp Rocky Linux 9 2:2.11.7-1.el9_7.1
- freerdp Rocky Linux 8 2:2.11.7-2.el8_10
rocky linux advisories RLSA-2026:2222RLSA-2026:2048RLSA-2026:2081
- freerdp Alpine 3.23 3.22.0-r0
- freerdp Alpine 3.24 3.21.0-r0
alpine advisories ALPINE-CVE-2026-23534
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-2026-23534 updated cvss 7.6
freerdp: FreeRDP: Arbitrary code execution and denial of service via client-side heap buffer overflow
-
Red Hat Enterprise Linux 6 freerdp, freerdp-libs, freerdp-pluginsaffected: no fix planned “Will not fix”
-
Red Hat CodeReady Linux Builder EUS (v.9.4) freerdp-devel 2.11.2-1.el9_4.1, libwinpr-devel 2.11.2-1.el9_4.1, freerdp-debuginfo 2.11.2-1.el9_4.1, libwinpr-debuginfo 2.11.2-1.el9_4.1, freerdp-debugsource 2.11.2-1.el9_4.1, freerdp-libs-debuginfo 2.11.2-1.el9_4.1fixed: vendor fix RHSA-2026:2736
-
Red Hat CodeReady Linux Builder EUS (v.9.6) freerdp-devel 2.11.7-1.el9_6.1, libwinpr-devel 2.11.7-1.el9_6.1, freerdp-debuginfo 2.11.7-1.el9_6.1, libwinpr-debuginfo 2.11.7-1.el9_6.1, freerdp-debugsource 2.11.7-1.el9_6.1, freerdp-libs-debuginfo 2.11.7-1.el9_6.1fixed: vendor fix RHSA-2026:3037
-
Red Hat Enterprise Linux AppStream (v. 8) freerdp 2.11.7-2.el8_10, libwinpr 2.11.7-2.el8_10, freerdp-libs 2.11.7-2.el8_10fixed: vendor fix RHSA-2026:2081
-
Red Hat Enterprise Linux AppStream (v. 9) freerdp 2.11.7-1.el9_7.1, libwinpr 2.11.7-1.el9_7.1, freerdp-libs 2.11.7-1.el9_7.1fixed: vendor fix RHSA-2026:2048
-
Red Hat Enterprise Linux AppStream (v. 10) freerdp 3.10.3-5.el10_1.1, libwinpr 3.10.3-5.el10_1.1, freerdp-libs 3.10.3-5.el10_1.1fixed: vendor fix RHSA-2026:2222
-
Red Hat Enterprise Linux AppStream EUS (v. 10.0) freerdp 3.10.3-3.el10_0.1, libwinpr 3.10.3-3.el10_0.1, freerdp-libs 3.10.3-3.el10_0.1fixed: vendor fix RHSA-2026:2952
-
Red Hat Enterprise Linux AppStream EUS (v.9.4) freerdp 2.11.2-1.el9_4.1, libwinpr 2.11.2-1.el9_4.1, freerdp-libs 2.11.2-1.el9_4.1fixed: vendor fix RHSA-2026:2736
show 6 moreshow fewer
-
Red Hat Enterprise Linux AppStream EUS (v.9.6) freerdp 2.11.7-1.el9_6.1, libwinpr 2.11.7-1.el9_6.1, freerdp-libs 2.11.7-1.el9_6.1fixed: vendor fix RHSA-2026:3037
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Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) freerdp-devel 2.11.7-1.el9_7.1, libwinpr-devel 2.11.7-1.el9_7.1, freerdp-debuginfo 2.11.7-1.el9_7.1, libwinpr-debuginfo 2.11.7-1.el9_7.1, freerdp-debugsource 2.11.7-1.el9_7.1, freerdp-libs-debuginfo 2.11.7-1.el9_7.1fixed: vendor fix RHSA-2026:2048
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Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) freerdp-server 3.10.3-5.el10_1.1fixed: vendor fix RHSA-2026:2222
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Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) freerdp-server 3.10.3-3.el10_0.1fixed: vendor fix RHSA-2026:2952
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Red Hat Enterprise Linux CRB (v. 8) freerdp-devel 2.11.7-2.el8_10, freerdp-debuginfo 2.11.7-2.el8_10, libwinpr-debuginfo 2.11.7-2.el8_10, freerdp-debugsource 2.11.7-2.el8_10, freerdp-libs-debuginfo 2.11.7-2.el8_10fixed: vendor fix RHSA-2026:2081
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Red Hat Enterprise Linux 7 freerdp, libwinpr, freerdp-libs, freerdp-pluginsnot 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
- yes
- Technical impact
- partial
- Assessed
- 9 mo ago
Exploit prediction
0.53% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3frr-mp8w-4599 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 7.7 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P |
| CISA ADP | 3.1 | 7.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H |
| CNA | 4.0 | 7.7 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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 | 7.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/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 8
- Red Hat Red Hat Enterprise Linux 9
- 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
- Red Hat Red Hat Enterprise Linux 7
Classification
- Weakness
-
- CWE-122 Heap-based Buffer Overflow
References
-
github.com
/FreeRDP/FreeRDP/security/advisories/GHSA-3frr-mp8w-4599
exploit, vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:2952
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:2222
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:2081
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:2736
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:3037
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:2048
vendor-advisory
-
github.com
/FreeRDP/FreeRDP/blob/38514dfa5813aa945a86cfbcec279033f8394468/libfreerdp/codec/clear.c#L878-L879
product
-
github.com
/FreeRDP/FreeRDP/blob/38514dfa5813aa945a86cfbcec279033f8394468/libfreerdp/codec/clear.c#L883-L884
product
-
github.com
/FreeRDP/FreeRDP/releases/tag/3.21.0
release-notes
-
access.redhat.com
/security/cve/CVE-2026-23534
vdb-entry
-
bugzilla.redhat.com
/show_bug.cgi?id=2430888
issue-tracking
- security.access.redhat.com /data/csaf/v2/vex/2026/cve-2026-23534.json
Sources
- CVE List CVE-2026-23534
- NVD CVE-2026-23534
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.