CVE-2026-33984

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in resize_vbar_entry() in libfreerdp/codec/clear.c, vBarEntry->size is updated to vBarEntry->count before the winpr_aligned_recalloc() call. If realloc fails, size is inflated while pixels still points to the old, smaller buffer. On a subsequent call where count <= size (the inflated value), realloc is skipped. The caller then writes count * bpp bytes of attacker-controlled pixel data into the undersized buffer, causing a heap buffer overflow. This issue has been patched in version 3.24.2.

Affected Software

VendorProductVersion RangeStatus
FreeRDPFreeRDP< 3.24.2affected

Weaknesses

  • CWE-122: CWE-122: Heap-based Buffer Overflow
  • CWE-131: CWE-131: Incorrect Calculation of Buffer Size

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

FreeRDP: FreeRDP: Heap buffer overflow allows arbitrary code execution via crafted pixel data

Additional References

References