CVE-2026-22853

FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license. The xfreerdp client can connect to RDP servers such as Microsoft Windows machines, xrdp, and VirtualBox.

Security Fix(es):

• freerdp: FreeRDP heap-buffer-overflow (CVE-2026-22855)

• freerdp: FreeRDP heap-buffer-overflow (CVE-2026-22853)

• freerdp: FreeRDP global-buffer-overflow (CVE-2026-22858)

• freerdp: FreeRDP heap-buffer-overflow (CVE-2026-22859)

• freerdp: FreeRDP: Denial of Service via use after free in ecam_channel_write (CVE-2026-24678)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, RDPEAR’s NDR array reader does not perform bounds checking on the on‑wire element count and can write past the heap buffer allocated from hints, causing a heap buffer overflow in ndr_read_uint8Array. This vulnerability is fixed in 3.20.1.

FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license. The xfreerdp client can connect to RDP servers such as Microsoft Windows machines, xrdp, and VirtualBox.

Security Fix(es):

• freerdp: FreeRDP heap-buffer-overflow (CVE-2026-22855)
• freerdp: FreeRDP heap-buffer-overflow (CVE-2026-22853)
• freerdp: FreeRDP global-buffer-overflow (CVE-2026-22858)
• freerdp: FreeRDP heap-buffer-overflow (CVE-2026-22859)
• freerdp: FreeRDP: Denial of Service via use after free in ecam_channel_write (CVE-2026-24678)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Updated packages bring lot of security fixes. Please see the links for additional information.

These are all security issues fixed in the freerdp-3.20.2-1.1 package on the GA media of openSUSE Tumbleweed.

This update for freerdp fixes the following issues:

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:

  *…

This update for freerdp fixes the following issues:

• 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)

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.