FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, a race condition between the RDPGFX dynamic virtual channel thread and the SDL render thread leads to a heap use-after-free. Specifically, an escaped pointer to sdl->primary (SDL_Surface) is accessed after it has been freed during RDPGFX ResetGraphics handling. This vulnerability is fixed in 3.20.1.

The remote Ubuntu 24.04 LTS / 25.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8105-1 advisory.

    It was discovered that FreeRDP incorrectly handled certain RDP packets. A remote attacker could use this     issue to cause FreeRDP to crash, resulting in a denial of service, or possibly execute arbitrary code.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:20339-1 advisory.

    Update to version 3.22.0 (jsc#PED-15526):

      - Major bugfix release:

        * Complete overhaul of SDL client
        * Introduction of new WINPR_ATTR_NODISCARD macro wrapping compiler or C language version specific     [[nodiscard]] attributes
        * Addition of WINPR_ATTR_NODISCARD to (some) public API functions so usage errors are producing     warnings now
        * Add some more stringify functions for logging
        * We've received CVE reports, check           https://github.com/FreeRDP/FreeRDP/security/advisories for more details!           @Keryer reported an issue affecting client and proxy:
          * CVE-2026-23948           @ehdgks0627 did some more fuzzying and found quite a number of client side bugs.
          * CVE-2026-24682
          * CVE-2026-24683
          * CVE-2026-24676
          * CVE-2026-24677
          * CVE-2026-24678
          * CVE-2026-24684
          * CVE-2026-24679
          * CVE-2026-24681
          * CVE-2026-24675
          * CVE-2026-24491
          * CVE-2026-24680

    - Changes from version 3.21.0

      * [core,info] fix missing NULL check (#12157)
      * [gateway,tsg] fix TSG_PACKET_RESPONSE parsing (#12161)
      * Allow querying auth identity with kerberos when running as a server (#12162)
      * Sspi krb heimdal (#12163)
      * Tsg fix idleTimeout parsing (#12167)
      * [channels,smartcard] revert 649f7de (#12166)
      * [crypto] deprecate er and der modules (#12170)
      * [channels,rdpei] lock full update, not only parts (#12175)
      * [winpr,platform] add WINPR_ATTR_NODISCARD macro (#12178)
      * Wlog cleanup (#12179)
      * new stringify functions & touch API defines (#12180)
      * Add support for querying SECPKG_ATTR_PACKAGE_INFO to NTLM and Kerberos (#12171)
      * [channels,video] measure times in ns (#12184)
      * [utils] Nodiscard (#12187)
      * Error handling fixes (#12186)
      * [channels,drdynvc] check pointer before reset (#12189)
      * Winpr api def (#12190)
      * [winpr,platform] drop C23 [[nodiscard]] (#12192)
      * [gdi] add additional checks for a valid rdpGdi (#12194)
      * Sdl3 high dpiv2 (#12173)
      * peer: Disconnect if Logon() returned FALSE (#12196)
      * [channels,rdpecam] fix PROPERTY_DESCRIPTION parsing (#12197)
      * [channel,rdpsnd] only clean up thread before free (#12199)
      * [channels,rdpei] add RDPINPUT_CONTACT_FLAG_UP (#12195)

    - Update to version 3.21.0:

      - Bugfix release with a few new API functions addressing shortcomings with         regard to input data validation.
        Thanks to @ehdgks0627 we have fixed the following additional (medium)         client side vulnerabilities:

        * CVE-2026-23530
        * CVE-2026-23531
        * CVE-2026-23532
        * CVE-2026-23533
        * CVE-2026-23534
        * CVE-2026-23732
        * CVE-2026-23883
        * CVE-2026-23884

    - Changes from version 3.20.2

      * [client,sdl] fix monitor resolution (#12142)
      * [codec,progressive] fix progressive_rfx_upgrade_block (#12143)
      * Krb cache fix (#12145)
      * Rdpdr improved checks (#12141)
      * Codec advanced length checks (#12146)
      * Glyph fix length checks (#12151)
      * Wlog printf format string checks (#12150)
      * [warnings,format] fix format string warnings (#12152)
      * Double free fixes (#12153)
      * [clang-tidy] clean up code warnings (#12154)

    - Update to version 3.20.2:

      - Patch release fixing a regression with gateway connections         introduced with 3.20.1         ## What's Changed
        * Warnings and missing enumeration types (#12137)

    - Changes from version 3.20.1:

      - New years cleanup release. Fixes some issues reported and does         a cleaning sweep to bring down warnings.
        Thanks to @ehdgks0627 doing some code review/testing we've         uncovered the following (medium) vulnerabilities:

        * CVE-2026-22851
        * CVE-2026-22852
        * CVE-2026-22853
        * CVE-2026-22854
        * CVE-2026-22855
        * CVE-2026-22856
        * CVE-2026-22857
        * CVE-2026-22858
        * CVE-2026-22859

      - These affect FreeRDP based clients only, with the exception of         CVE-2026-22858 also affecting FreeRDP proxy. FreeRDP based         servers are not affected.

    - Update to version 3.20.0:

      * Mingw fixes (#12070)
      * [crypto,certificate_data] add some hostname sanitation
      * [client,common]: Fix loading of rdpsnd channel
      * [client,sdl] set touch and pen hints

    - Changes from version 3.19.1:

      * [core,transport] improve SSL error logging
      * [utils,helpers] fix freerdp_settings_get_legacy_config_path
      * From stdin and sdl-creds improve
      * [crypto,certificate] sanitize hostnames
      * [channels,drdynvc] propagate error in dynamic channel
      * [CMake] make Mbed-TLS and LibreSSL experimental
      * Json fix
      * rdpecam: send sample only if it's available
      * [channels,rdpecam] allow MJPEG frame skip and direct passthrough
      * [winpr,utils] explicit NULL checks in jansson WINPR_JSON_ParseWithLength

    - Changes from version 3.19.0:

      * [client,common] fix retry counter
      * [cmake] fix aarch64 neon detection
      * Fix response body existence check when using RDP Gateway
      * fix line clipping issue
      * Clip coord fix
      * [core,input] Add debug log to keyboard state sync
      * Update command line usage for gateway option
      * [codec,ffmpeg] 8.0 dropped AV_PROFILE_AAC_MAIN
      * [channels,audin] fix pulse memory leak
      * [channels,drive] Small performance improvements in drive channel
      * [winpr,utils] fix command line error logging
      * [common,test] Adjust AVC and H264 expectations
      * drdynvc: implement compressed packet
      * [channels,rdpecam] improve log messages
      * Fix remote credential guard channel loading
      * Fix inverted ifdef
      * [core,nego] disable all enabled modes except the one requested
      * rdpear: handle basic NTLM commands and fix server-side
      * [smartcardlogon] Fix off-by-one error in `smartcard_hw_enumerateCerts`
      * rdpecam: fix camera sample grabbing

    - Update to version 3.18.0:

      - Fix a regression reading passwords from stdin
      - Fix a timer regression (?s instead of ms)
      - Improved multitouch support
      - Fix a bug with PLANAR codec (used with /bpp:32 or sometimes with /gfx)
      - Better error handling for ARM transport (Entra)
      - Fix audio encoder lag (microphone/AAC) with FFMPEG
      - Support for janssen JSON library

    - Update to version 3.17.2:

      - Minor improvements and bugfix release.
      - Most notably resource usage (file handles) has been greatly reduced and         static build pkg-config have been fixed.
        For users of xfreerdp RAILS/RemoteApp mode the switch to DesktopSession         mode has been fixed (working UAC screen)

    - Changes from version 3.17.1

      - Minor improvements and bugfix release.
        * most notably a memory leak was addressed
        * fixed header files missing C++ guards
        * xfreerdp as well as the SDL clients now support a system wide configuration file
        * Heimdal kerberos support was improved
        * builds with [MS-RDPEAR] now properly abort at configure if Heimdal is used           (this configuration was never supported, so ensure nobody compiles it that way)

    - Enable openh264 support, we can build against the noopenh264 stub

    - Update to 3.17.0:

      * [client,sdl2] fix build with webview (#11685)
      * [core,nla] use wcslen for password length (#11687)
      * Clear channel error prior to call channel init event proc (#11688)
      * Warn args (#11689)
      * [client,common] fix -mouse-motion (#11690)
      * [core,proxy] fix IPv4 and IPv6 length (#11692)
      * Regression fix2 (#11696)
      * Log fixes (#11693)
      * [common,settings] fix int casts (#11699)
      * [core,connection] fix log level of several messages (#11697)
      * [client,sdl] print current video driver (#11701)
      * [crypto,tls] print big warning for /cert:ignore (#11704)
      * [client,desktop] fix StartupWMClass setting (#11708)
      * [cmake] unify version creation (#11711)
      * [common,settings] force reallocation on caps copy (#11715)
      * [manpages] Add example of keyboard remapping (#11718)
      * Some fixes in Negotiate and NLA (#11722)
      * [client,x11] fix clipboard issues (#11724)
      * kerberos: do various tries for TGT retrieval in u2u (#11723)
      * Cmdline escape strings (#11735)
      * [winpr,utils] do not log command line arguments (#11736)
      * [api,doc] Add stylesheed for doxygen (#11738)
      * [core,proxy] fix BIO read methods (#11739)
      * [client,common] fix sso_mib_get_access_token return value in error case (#11741)
      * [crypto,tls] do not use context->settings->instance (#11749)
      * winpr: re-introduce the credentials module (#11734)
      * [winpr,timezone] ensure thread-safe initialization (#11754)
      * core/redirection: Ensure stream has enough space for the certificate (#11762)
      * [client,common] do not log success (#11766)
      * Clean up bugs exposed on systems with high core counts (#11761)
      * [cmake] add installWithRPATH (#11747)
      * [clang-tidy] fix various warnings (#11769)
      * Wlog improve type checks (#11774)
      * [client,common] fix tenantid command line parsing (#11779)
      * Proxy module static and shared linking support (#11768)
      * LoadLibrary Null fix (#11786)
      * [client,common] add freerdp_client_populate_settings_from_rdp_file_un (#11780)
      * Fullchain support (#11787)
      * [client,x11] ignore floatbar events (#11771)
      * [winpr,credentials] prefer utf-8 over utf-16-LE #11790
      * [proxy,modules] ignore bitmap-filter skip remaining #11789

    - Update to 3.16.0:
      * Lots of improvements for the SDL3 client
      * Various X11 client improvements
      * Add a timer implementation
      * Various AAD/Azure/Entra improvements
      * YUV420 primitives fixes
    - Update to 3.15.0:
      * [client,sdl] fix crash on suppress output
      * [channels,remdesk] fix possible memory leak
      * [client,x11] map exit code success
      * Hidef rail checks and deprecation fixe
      * Standard rdp security network issues
      * [core,rdp] fix check for SEC_FLAGSHI_VALID
      * [core,caps] fix rdp_apply_order_capability_set
      * [core,proxy] align no_proxy to curl
      * [core,gateway] fix string reading for TSG
      * [client,sdl] refactor display update

    - Update to version 3.14.0:

      - Bugfix and cleanup release. Due to some new API functions the         minor version has been increased.

    - Changes from version 3.13.0:

      - Friends of old hardware rejoice, serial port redirection got an         update (not kidding you)
      - Android builds have been updated to be usable again
      - Mingw builds now periodically do a shared and static build
      - Fixed some bugs and regressions along the way and improved test         coverage as well

    - Changes from version 3.12.0:

      - Multimonitor backward compatibility fixes
      - Smartcard compatibility
      - Improve the [MS-RDPECAM] support
      - Improve smartcard redirection support       + Refactor SSE optimizations: Split headers, unify load/store,         require SSE3 for all optimized functions       + Refactors the CMake build to better support configuration based         builders       + Fix a few regressions from last release (USB redirection and         graphical glitches)

    - Changes from version 3.11.0:

      + A new release with bugfixes and code cleanups as well as a few         nifty little features

    - CVE-2024-22211: In affected versions an integer overflow in         `freerdp_bitmap_planar_context_reset` leads to heap-buffer         overflow. (bsc#1219049)

    - CVE-2024-32658: Fixedout-of-bounds read in Interleaved RLE Bitmap Codec in FreeRDP based clients     (bsc#1223353)

    - Multiple CVE fixes       + CVE-2024-32659: Fixed out-of-bounds read if `((nWidth == 0) and (nHeight == 0))`(bsc#1223346)       + CVE-2024-32660: Fixed client crash via invalid huge allocation size (bsc#1223347)       + CVE-2024-32661: Fixed client NULL pointer dereference (bsc#1223348)

    - Multiple CVE fixes:
        * bsc#1223293, CVE-2024-32039
        * bsc#1223294, CVE-2024-32040
        * bsc#1223295, CVE-2024-32041
        * bsc#1223296, CVE-2024-32458
        * bsc#1223297, CVE-2024-32459
        * bsc#1223298, CVE-2024-32460

      * Fix CVE-2023-40574 - bsc#1214869: Out-Of-Bounds Write in general_YUV444ToRGB_8u_P3AC4R_BGRX
      * Fix CVE-2023-40575 - bsc#1214870: Out-Of-Bounds Read in general_YUV444ToRGB_8u_P3AC4R_BGRX
      * Fix CVE-2023-40576 - bsc#1214871: Out-Of-Bounds Read in RleDecompress

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1433 advisory.

    FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, a race condition between     the RDPGFX dynamic virtual channel thread and the SDL render thread leads to a heap use-after-free.
    Specifically, an escaped pointer to sdl->primary (SDL_Surface) is accessed after it has been freed during     RDPGFX ResetGraphics handling. This vulnerability is fixed in 3.20.1. (CVE-2026-22851)

    FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, a malicious RDP server     can trigger a heap-buffer-overflow write in the FreeRDP client when processing Audio Input (AUDIN) format     lists. audin_process_formats reuses callback->formats_count across multiple MSG_SNDIN_FORMATS PDUs and     writes past the newly allocated formats array, causing memory corruption and a crash. This vulnerability     is fixed in 3.20.1. (CVE-2026-22852)

    FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, a heap-buffer-overflow     occurs in drive read when a server-controlled read length is used to read file data into an IRP output     stream buffer without a hard upper bound, allowing an oversized read to overwrite heap memory. This     vulnerability is fixed in 3.20.1. (CVE-2026-22854)

    FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, a heap out-of-bounds     read occurs in the smartcard SetAttrib path when cbAttrLen does not match the actual NDR buffer length.
    This vulnerability is fixed in 3.20.1. (CVE-2026-22855)

    FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, a race in the serial     channel IRP thread tracking allows a heap use-after-free when one thread removes an entry from     serial->IrpThreads while another reads it. This vulnerability is fixed in 3.20.1. (CVE-2026-22856)

    FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, global-buffer-overflow     was observed in FreeRDP's Base64 decoding path. The root cause appears to be implementation-defined char     signedness: on Arm/AArch64 builds, plain char is treated as unsigned, so the guard c <= 0 can be optimized     into a simple c != 0 check. As a result, non-ASCII bytes (e.g., 0x80-0xFF) may bypass the intended range     restriction and be used as an index into a global lookup table, causing out-of-bounds access. This     vulnerability is fixed in 3.20.1. (CVE-2026-22858)

    FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, the URBDRC client does     not perform bounds checking on server-supplied MSUSB_INTERFACE_DESCRIPTOR values and uses them as indices     in libusb_udev_complete_msconfig_setup, causing an out-of-bounds read. This vulnerability is fixed in     3.20.1. (CVE-2026-22859)

    FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, FastGlyph     parsing trusts `cbData`/remaining length and never validates against the minimum size implied by `cx/cy`.
    A malicious server can trigger a client-side global buffer overflow, causing a crash (DoS). Version 3.21.0     contains a patch for the issue. (CVE-2026-23732)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:0345-1 advisory.

    - CVE-2025-4478: Fixed initialization of function pointers after       resource allocations (bsc#1243109)
    - CVE-2026-22851: Fixed RDPGFX ResetGraphics race leading to       use-after-free in SDL client (sdl->primary) (bsc#1256717)
    - CVE-2026-22852: Fixed heap-buffer-overflow in audin_process_formats       (bsc#1256718)
    - CVE-2026-22853: Fixed heap-buffer-overflow in ndr_read_uint8Array       (bsc#1256719)
    - CVE-2026-22854: Fixed heap-buffer-overflow in drive_process_irp_read       (bsc#1256720)
    - CVE-2026-22855: Fixed heap-buffer-overflow in smartcard_unpack_set_attrib_call       (bsc#1256721)
    - CVE-2026-22856: Fixed heap-use-after-free in create_irp_thread (bsc#1256722)
    - CVE-2026-22857: Fixed heap-use-after-free in irp_thread_func (bsc#1256723)
    - CVE-2026-22858: Fixed global-buffer-overflow in crypto_base64_devoce       (bsc#1256724)
    - CVE-2026-22859: Fixed heap-buffer-overflow in urb_select_configuration       (bsc#1256725)
    - CVE-2026-23530: Fixed improper validation leading to heap buffer overflow       in `planar_decompress_plane_rle` (bsc#1256940)
    - CVE-2026-23531: Fixed improper validation in `clear_decompress` leading to       heap buffer overflow (bsc#1256941)
    - CVE-2026-23532: Fixed mismatch between destination rectangle clamping and       the actual copy size leading to heap buffer overflow in       `gdi_SurfaceToSurface` (bsc#1256942)
    - CVE-2026-23533: Fixed improper validation leading to heap buffer overflow in       `clear_decompress_residual_data` (bsc#1256943)
    - CVE-2026-23534: Fixed missing checks leading to heap buffer overflow in       `clear_deceompress_bands_data` (bsc#1256944)
    - CVE-2026-23732: Fixed improper validation leading to heap buffer overflow in       `Glyph_alloc` (bsc#1256945)
    - CVE-2026-23883: Fixed use-after-free when `update_pointer_color` and       `freerdp_image_copy_fromPointer_data` fail (bsc#1256946)
    - CVE-2026-23884: Fixed use-after-free in `gdi_set_bounds` (bsc#1256947)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-a193f1698f advisory.

    Update to 3.20.2




Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-79f923d917 advisory.

    Update to 3.20.2




Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, a race condition between     the RDPGFX dynamic virtual channel thread and the SDL render thread leads to a heap use-after-free.
    Specifically, an escaped pointer to sdl->primary (SDL_Surface) is accessed after it has been freed during     RDPGFX ResetGraphics handling. This vulnerability is fixed in 3.20.1. (CVE-2026-22851)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
303026	Ubuntu 24.04 LTS / 25.10 : FreeRDP vulnerabilities (USN-8105-1)	Nessus	Ubuntu Local Security Checks	high
302093	openSUSE 16 Security Update : freerdp (openSUSE-SU-2026:20339-1)	Nessus	SuSE Local Security Checks	high
299562	Amazon Linux 2023 : freerdp, freerdp-devel, freerdp-libs (ALAS2023-2026-1433)	Nessus	Amazon Linux Local Security Checks	high
297418	SUSE SLED15 / SLES15 Security Update : freerdp (SUSE-SU-2026:0345-1)	Nessus	SuSE Local Security Checks	high
294816	Fedora 42 : freerdp (2026-a193f1698f)	Nessus	Fedora Local Security Checks	high
291266	Fedora 43 : freerdp (2026-79f923d917)	Nessus	Fedora Local Security Checks	high
284677	Linux Distros Unpatched Vulnerability : CVE-2026-22851	Nessus	Misc.	high

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CVE-2026-22851

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