CVE-2026-40033

Summary

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 operations using unclamped cache entry dimensions, enabling malicious RDP servers to trigger large out-of-bounds writes and potentially achieve remote code execution or client crash.

Affected Software

Weaknesses

• CWE-122: Heap-based Buffer Overflow

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: total

Additional References

• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-p6r2-4hgm-m6ff

freerdp: FreeRDP: Remote code execution via heap-buffer-overflow in gdi_CacheToSurface

Additional References

• https://access.redhat.com/security/cve/CVE-2026-40033
• https://bugzilla.redhat.com/show_bug.cgi?id=2481473
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40033.json

References

• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-p6r2-4hgm-m6ff
• https://github.com/FreeRDP/FreeRDP/pull/12713
• https://github.com/FreeRDP/FreeRDP/commit/d7508ebcd82842a691ae4941e5104d14240a89ae
• https://www.vulncheck.com/advisories/freerdp-heap-buffer-overflow-in-gdi-cachetosurface-via-rectangle-validation-bypass

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