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High ELSA-2026-36203 5 CVEs

Important: freerdp security update (Oracle Linux 10)

Published Jul 16, 2026 · Updated Jul 16, 2026

Ecosystem: Oracle Linux

Summary

[2:3.10.3-12.6]
- Backport several CVE fixes (CVE-2026-40033, CVE-2026-44420, CVE-2026-44421,
CVE-2026-44422, CVE-2026-45700)
Resolves: RHEL-186978, RHEL-186967, RHEL-186958, RHEL-186950, RHEL-186093

[2:3.10.3-12.5]
- Lock appWindow to fix use-after-free in RAIL mode (CVE-2026-25952)
Resolves: RHEL-159848

[2:3.10.3-12.4]
- Fix double free in xf_rail_window_common cleanup (CVE-2026-26986)
- Fix clipboard use-after-free during auto-reconnect (CVE-2026-25997)
- Fix heap-buffer-overflow in bitmap_cache_put (CVE-2026-29775)
- Add DSP format checks (CVE-2026-31884)
- Fix DSP array bounds checks (CVE-2026-31883)
- Fix DSP array bounds checks (CVE-2026-31885)
- Update PERSISTENT_CACHE_ENTRY::size after realloc (CVE-2026-33987)
- Update CLEAR_GLYPH_ENTRY::count after alloc (CVE-2026-33985)
- Use winpr_aligned_calloc in persistent cache (CVE-2026-33982)
Resolves: RHEL-159804, RHEL-159660, RHEL-161034, RHEL-161469
Resolves: RHEL-161505, RHEL-161072, RHEL-163654, RHEL-168462, RHEL-162931

Fixed packages 6

ReleasePackageFixed in
Oracle Linux · 10 freerdp 2:3.10.3-12.el10_2.6
Oracle Linux · 10 freerdp-devel 2:3.10.3-12.el10_2.6
Oracle Linux · 10 freerdp-libs 2:3.10.3-12.el10_2.6
Oracle Linux · 10 freerdp-server 2:3.10.3-12.el10_2.6
Oracle Linux · 10 libwinpr 2:3.10.3-12.el10_2.6
Oracle Linux · 10 libwinpr-devel 2:3.10.3-12.el10_2.6

Vulnerabilities 5

  • High 8.8
    CVE-2026-40033

    FreeRDP - Heap-buffer-overflow in gdi_CacheToSurface via rectangle validation bypass

    FreeRDP before 3.26.0 contains a heap-buffer-overflow vulnerability in gdi_CacheToSurface that allows remote attackers to write out-of-bounds heap memory. The vulnerability occurs because rectangle validation clamps coordinates to UINT16_MAX but performs copy…

    FreeRDP FreeRDP freerdp2 freerdp2 Debian Ubuntu
  • High 8.8
    CVE-2026-44420

    FreeRDP cliprdr server heap-buffer-overflow via undersized capabilitySetLength in CB_CLIP_CAPS

    FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, a malicious RDP client can trigger a heap-buffer-overflow write in FreeRDP's server-side clipboard (cliprdr) channel by sending a CB_CLIP_CAPS PDU with a too-small capabilitySet…

    FreeRDP FreeRDP freerdp2 freerdp2 Debian Ubuntu
  • High 8.8
    CVE-2026-44421

    FreeRDP RDPGFX CacheToSurface heap-buffer-overflow via clamped-rectangle validation bypass

    FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, a malicious RDP server can trigger a heap-buffer-overflow write in the FreeRDP client by sending crafted RDPGFX PDUs. The bug is in gdi_CacheToSurface: it validates a destinatio…

    FreeRDP FreeRDP freerdp2 freerdp2 Debian Ubuntu
  • High 7.7
    CVE-2026-45700

    Heap-buffer-overflow write in planar bitmap decoder

    FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, FreeRDP's planar bitmap decoder has an out-of-bounds heap write when decoding RLE planar data. In libfreerdp/codec/planar.c, freerdp_bitmap_decompress_planar() validates the X d…

    FreeRDP FreeRDP freerdp2 freerdp2 Debian Ubuntu
  • High 7.5
    CVE-2026-44422

    FreeRDP RDPEAR NDR ref-id aliasing causes client-side UAF/double-free and type confusion

    FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, FreeRDP's RDPEAR NDR parser accepts one non-null NDR pointer ref-id for multiple logical pointer fields without tracking the pointed object's expected NDR type or ownership. Whe…

    FreeRDP FreeRDP freerdp2 freerdp2 Debian Ubuntu