CVE-2026-23948

FreeRDP is a client implementation of the Remote Desktop Protocol (RDP) that follows Microsoft's open specifications. This package provides the client applications xfreerdp.

Security Fix(es):

A NULL pointer dereference vulnerability exists in the rdp_write_logon_info_v2() function of FreeRDP remote desktop protocol implementation, which could be exploited by attackers to cause service crashes.(CVE-2026-23948)

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-use-after-free (CVE-2026-22856)

• freerdp: FreeRDP heap-buffer-overflow (CVE-2026-22854)

• freerdp: FreeRDP heap-buffer-overflow (CVE-2026-22852)

• freerdp: FreeRDP: Denial of Service via FastGlyph parsing buffer overflow (CVE-2026-23732)

• freerdp: FreeRDP: Denial of Service via use-after-free in AUDIN format renegotiation (CVE-2026-24676)

• freerdp: FreeRDP has a heap-use-after-free in video_timer (CVE-2026-24491)

• freerdp: FreeRDP has a NULL Pointer Dereference in rdp_write_logon_info_v2() (CVE-2026-23948)

• freerdp: FreeRDP has a Heap-use-after-free in play_thread (CVE-2026-24684)

• freerdp: FreeRDP has a heap-use-after-free in urb_bulk_transfer_cb (CVE-2026-24681)

• freerdp: FreeRDP has a heap-use-after-free in ainput_send_input_event (CVE-2026-24683)

• freerdp: FreeRDP has a heap-buffer-overflow in urb_select_interface (CVE-2026-24679)

• freerdp: FreeRDP has a Heap-use-after-free in urb_select_interface (CVE-2026-24675)

• freerdp: FreeRDP: Arbitrary code execution via crafted Remote Desktop Protocol (RDP) server messages (CVE-2026-31806)

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 (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-use-after-free (CVE-2026-22856)

• freerdp: FreeRDP heap-buffer-overflow (CVE-2026-22854)

• freerdp: FreeRDP heap-buffer-overflow (CVE-2026-22852)

• freerdp: FreeRDP: Denial of Service via FastGlyph parsing buffer overflow (CVE-2026-23732)

• freerdp: FreeRDP: Denial of Service via use-after-free in AUDIN format renegotiation (CVE-2026-24676)

• freerdp: FreeRDP has a heap-use-after-free in video_timer (CVE-2026-24491)

• freerdp: FreeRDP has a NULL Pointer Dereference in rdp_write_logon_info_v2() (CVE-2026-23948)

• freerdp: FreeRDP has a Heap-use-after-free in play_thread (CVE-2026-24684)

• freerdp: FreeRDP has a heap-use-after-free in urb_bulk_transfer_cb (CVE-2026-24681)

• freerdp: FreeRDP has a Heap-buffer-overflow in audio_formats_free (CVE-2026-24682)

• freerdp: FreeRDP has a heap-use-after-free in ainput_send_input_event (CVE-2026-24683)

• freerdp: FreeRDP has a heap-buffer-overflow in urb_select_interface (CVE-2026-24679)

• freerdp: FreeRDP has a Heap-use-after-free in urb_select_interface (CVE-2026-24675)

• freerdp: FreeRDP: Arbitrary code execution via crafted Remote Desktop Protocol (RDP) server messages (CVE-2026-31806)

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 (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-use-after-free (CVE-2026-22856)

• freerdp: FreeRDP heap-buffer-overflow (CVE-2026-22854)

• freerdp: FreeRDP heap-buffer-overflow (CVE-2026-22852)

• freerdp: FreeRDP: Denial of Service via FastGlyph parsing buffer overflow (CVE-2026-23732)

• freerdp: FreeRDP: Denial of Service via use-after-free in AUDIN format renegotiation (CVE-2026-24676)

• freerdp: FreeRDP has a heap-use-after-free in video_timer (CVE-2026-24491)

• freerdp: FreeRDP has a NULL Pointer Dereference in rdp_write_logon_info_v2() (CVE-2026-23948)

• freerdp: FreeRDP has a Heap-use-after-free in play_thread (CVE-2026-24684)

• freerdp: FreeRDP has a heap-use-after-free in urb_bulk_transfer_cb (CVE-2026-24681)

• freerdp: FreeRDP has a heap-use-after-free in ainput_send_input_event (CVE-2026-24683)

• freerdp: FreeRDP has a heap-buffer-overflow in urb_select_interface (CVE-2026-24679)

• freerdp: FreeRDP has a Heap-use-after-free in urb_select_interface (CVE-2026-24675)

• freerdp: FreeRDP: Arbitrary code execution via crafted Remote Desktop Protocol (RDP) server messages (CVE-2026-31806)

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 3.22.0, a NULL pointer dereference vulnerability in rdp_write_logon_info_v2() allows a malicious RDP server to crash FreeRDP proxy by sending a specially crafted LogonInfoV2 PDU with cbDomain=0 or cbUserName=0. This vulnerability is fixed in 3.22.0.

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-use-after-free (CVE-2026-22856)
• freerdp: FreeRDP heap-buffer-overflow (CVE-2026-22854)
• freerdp: FreeRDP heap-buffer-overflow (CVE-2026-22852)
• freerdp: FreeRDP: Denial of Service via FastGlyph parsing buffer overflow (CVE-2026-23732)
• freerdp: FreeRDP: Denial of Service via use-after-free in AUDIN format renegotiation (CVE-2026-24676)
• freerdp: FreeRDP has a heap-use-after-free in video_timer (CVE-2026-24491)
• freerdp: FreeRDP has a NULL Pointer Dereference in rdp_write_logon_info_v2() (CVE-2026-23948)
• freerdp: FreeRDP has a Heap-use-after-free in play_thread (CVE-2026-24684)
• freerdp: FreeRDP has a heap-use-after-free in urb_bulk_transfer_cb (CVE-2026-24681)
• freerdp: FreeRDP has a heap-use-after-free in ainput_send_input_event (CVE-2026-24683)
• freerdp: FreeRDP has a heap-buffer-overflow in urb_select_interface (CVE-2026-24679)
• freerdp: FreeRDP has a Heap-use-after-free in urb_select_interface (CVE-2026-24675)
• freerdp: FreeRDP: Arbitrary code execution via crafted Remote Desktop Protocol (RDP) server messages (CVE-2026-31806)

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 (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-use-after-free (CVE-2026-22856)
• freerdp: FreeRDP heap-buffer-overflow (CVE-2026-22854)
• freerdp: FreeRDP heap-buffer-overflow (CVE-2026-22852)
• freerdp: FreeRDP: Denial of Service via FastGlyph parsing buffer overflow (CVE-2026-23732)
• freerdp: FreeRDP: Denial of Service via use-after-free in AUDIN format renegotiation (CVE-2026-24676)
• freerdp: FreeRDP has a heap-use-after-free in video_timer (CVE-2026-24491)
• freerdp: FreeRDP has a NULL Pointer Dereference in rdp_write_logon_info_v2() (CVE-2026-23948)
• freerdp: FreeRDP has a Heap-use-after-free in play_thread (CVE-2026-24684)
• freerdp: FreeRDP has a heap-use-after-free in urb_bulk_transfer_cb (CVE-2026-24681)
• freerdp: FreeRDP has a Heap-buffer-overflow in audio_formats_free (CVE-2026-24682)
• freerdp: FreeRDP has a heap-use-after-free in ainput_send_input_event (CVE-2026-24683)
• freerdp: FreeRDP has a heap-buffer-overflow in urb_select_interface (CVE-2026-24679)
• freerdp: FreeRDP has a Heap-use-after-free in urb_select_interface (CVE-2026-24675)
• freerdp: FreeRDP: Arbitrary code execution via crafted Remote Desktop Protocol (RDP) server messages (CVE-2026-31806)

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 (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-use-after-free (CVE-2026-22856)
• freerdp: FreeRDP heap-buffer-overflow (CVE-2026-22854)
• freerdp: FreeRDP heap-buffer-overflow (CVE-2026-22852)
• freerdp: FreeRDP: Denial of Service via FastGlyph parsing buffer overflow (CVE-2026-23732)
• freerdp: FreeRDP: Denial of Service via use-after-free in AUDIN format renegotiation (CVE-2026-24676)
• freerdp: FreeRDP has a heap-use-after-free in video_timer (CVE-2026-24491)
• freerdp: FreeRDP has a NULL Pointer Dereference in rdp_write_logon_info_v2() (CVE-2026-23948)
• freerdp: FreeRDP has a Heap-use-after-free in play_thread (CVE-2026-24684)
• freerdp: FreeRDP has a heap-use-after-free in urb_bulk_transfer_cb (CVE-2026-24681)
• freerdp: FreeRDP has a heap-use-after-free in ainput_send_input_event (CVE-2026-24683)
• freerdp: FreeRDP has a heap-buffer-overflow in urb_select_interface (CVE-2026-24679)
• freerdp: FreeRDP has a Heap-use-after-free in urb_select_interface (CVE-2026-24675)
• freerdp: FreeRDP: Arbitrary code execution via crafted Remote Desktop Protocol (RDP) server messages (CVE-2026-31806)

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.

• CVE-2026-23948: fix missing NULL check in core/info
• CVE-2026-24491: reset channel_callback before close in drdynvc
• CVE-2026-24676: reset audin->format in channels/audin
• CVE-2026-24680: reset pointer after memory release in Wayland client
• CVE-2026-24681: cancel all USB transfers on channel close in urbdrc
• CVE-2026-24684: terminate rdpsnd thread before free

FreeRDP has heap-buffer-overflow in planar_decompress_plane_rle. (CVE-2026-23530) FreeRDP has heap-buffer-overflow in clear_decompress. (CVE-2026-23531) FreeRDP has heap-buffer-overflow in gdi_SurfaceToSurface. (CVE-2026-23532) FreeRDP has heap-buffer-overflow in clear_decompress_residual_data. (CVE-2026-23533) FreeRDP has heap-buffer-overflow in clear_decompress_bands_data. (CVE-2026-23534) FreeRDP has a NULL Pointer Dereference in rdp_write_logon_info_v2(). (CVE-2026-23948) FreeRDP has a heap-use-after-free in video_timer. (CVE-2026-24491) FreeRDP has a Heap-use-after-free in urb_select_interface. (CVE-2026-24675) FreeRDP has a heap-use-after-free in audio_format_compatible. (CVE-2026-24676) FreeRDP has a heap-buffer-overflow in ecam_encoder_compress_h264. (CVE-2026-24677) FreeRDP has a Heap-use-after-free in cam_v4l_stream_capture_thread. (CVE-2026-24678) FreeRDP has a heap-buffer-overflow in urb_select_interface. (CVE-2026-24679) FreeRDP has a heap-use-after-free in update_pointer_new(SDL). (CVE-2026-24680) FreeRDP has a heap-use-after-free in urb_bulk_transfer_cb. (CVE-2026-24681) FreeRDP has a Heap-buffer-overflow in audio_formats_free. (CVE-2026-24682) FreeRDP has a heap-use-after-free in ainput_send_input_event. (CVE-2026-24683) FreeRDP has a Heap-use-after-free in play_thread. (CVE-2026-24684)

These are all security issues fixed in the freerdp-3.22.0-1.1 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:

  *…

It was discovered that FreeRDP incorrectly handled memory under certain circumstances, which could lead to a NULL pointer dereference. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-23948)

It was discovered that FreeRDP did not correctly validate the size of certain variables, which could cause a buffer overflow. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. This issue only affected FreeRDP3 in Ubuntu 24.04 LTS and Ubuntu 25.10. (CVE-2026-24491)

It was discovered that FreeRDP did not correctly validate the size of certain variables, which could cause a buffer overflow. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-24675, CVE-2026-24679, CVE-2026-24682)

It was discovered that FreeRDP had a use after free vulnerability under certain circumstances. An attacker could use this to cause a denial of service or possibly execute arbitrary code. (CVE-2026-24676, CVE-2026-24681)

It was discovered that FreeRDP did not correctly validate the size of certain variables, which could cause a buffer overflow. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. This issue only affected Ubuntu 25.10. (CVE-2026-24677)

It was discovered that FreeRDP had a use after free vulnerability under certain circumstances. An attacker could use this to cause a denial of service or possibly execute arbitrary code. This issue only affected Ubuntu 25.10. (CVE-2026-24678)

It was discovered that FreeRDP had a use after free vulnerability under certain circumstances. An attacker could use this to cause a denial of service or possibly execute arbitrary code. This issue only affected FreeRDP3 in Ubuntu 24.04 LTS and Ubuntu 25.10. (CVE-2026-24680)

It was discovered that FreeRDP had a use after free vulnerability under certain circumstances. An attacker could use this to cause a denial of service or possibly execute arbitrary code. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS and Ubuntu 25.10. (CVE-2026-24683, CVE-2026-24684)