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Medium ALAS2023-2026-1433 8 CVEs

Moderate: freerdp security update (Amazon Linux 2023)

Published Feb 16, 2026 · Updated Feb 18, 2026

Ecosystem: Amazon Linux

Summary

Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities: CVE-2026-23732: 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-2026-22859: 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-2026-22858: 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-2026-22856: 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-2026-22855: 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-2026-22854: 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-2026-22852: 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-2026-22851: 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.

Fixed packages 11

ReleasePackageFixed in
Amazon Linux · 2023 freerdp 2:3.6.3-1.amzn2023.0.3
Amazon Linux · 2023 freerdp-debuginfo 2:3.6.3-1.amzn2023.0.3
Amazon Linux · 2023 freerdp-debugsource 2:3.6.3-1.amzn2023.0.3
Amazon Linux · 2023 freerdp-devel 2:3.6.3-1.amzn2023.0.3
Amazon Linux · 2023 freerdp-libs 2:3.6.3-1.amzn2023.0.3
Amazon Linux · 2023 freerdp-libs-debuginfo 2:3.6.3-1.amzn2023.0.3
Amazon Linux · 2023 freerdp-server 2:3.6.3-1.amzn2023.0.3
Amazon Linux · 2023 freerdp-server-debuginfo 2:3.6.3-1.amzn2023.0.3
Amazon Linux · 2023 libwinpr 2:3.6.3-1.amzn2023.0.3
Amazon Linux · 2023 libwinpr-debuginfo 2:3.6.3-1.amzn2023.0.3
Amazon Linux · 2023 libwinpr-devel 2:3.6.3-1.amzn2023.0.3

Vulnerabilities 8

  • Medium 6.9
    CVE-2026-22851

    FreeRDP RDPGFX ResetGraphics race leads to use-after-free in SDL client (sdl->primary)

    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 (SD…

    FreeRDP FreeRDP freerdp2 freerdp2 Debian Ubuntu Alpine Wolfi
  • Medium 6.8
    CVE-2026-22852

    FreeRDP has a heap-buffer-overflow in audin_process_formats

    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->fo…

    FreeRDP FreeRDP freerdp2 freerdp2 Debian Ubuntu Alpine Wolfi
  • Medium 6.8
    CVE-2026-22854

    FreeRDP has a heap-buffer-overflow in drive_process_irp_read

    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 …

    FreeRDP FreeRDP freerdp2 freerdp2 Debian Ubuntu Alpine Wolfi
  • Medium 6.8
    CVE-2026-22856

    FreeRDP has a heap-use-after-free in create_irp_thread

    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…

    FreeRDP FreeRDP freerdp2 freerdp2 Debian Ubuntu Alpine Wolfi
  • Medium 5.6
    CVE-2026-22855

    FreeRDP has a heap-buffer-overflow in smartcard_unpack_set_attrib_call

    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.

    FreeRDP FreeRDP freerdp2 freerdp2 Debian Ubuntu Alpine Wolfi
  • Medium 5.6
    CVE-2026-22858

    FreeRDP has a global-buffer-overflow in crypto_base64_decode

    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 …

    FreeRDP FreeRDP freerdp2 freerdp2 Debian Ubuntu Alpine Wolfi
  • Medium 5.6
    CVE-2026-22859

    FreeRDP has a heap-buffer-overflow in urb_select_configuration

    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 …

    FreeRDP FreeRDP freerdp2 freerdp2 Debian Ubuntu Alpine Wolfi
  • Medium 5.5
    CVE-2026-23732

    FreeRDP has heap-buffer-overflow in Glyph_Alloc

    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 b…

    FreeRDP FreeRDP freerdp2 freerdp2 Debian Ubuntu Alpine Wolfi

References

  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-22851.html
  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-22852.html
  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-22854.html
  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-22855.html
  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-22856.html
  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-22858.html
  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-22859.html
  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-23732.html