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7.5
CVE-2026-33984: FreeRDP versions before 3.24.2 allow attackers to corrupt system memory
CVE-2026-33984
Summary
FreeRDP, a software for remote desktop connections, has a security issue that allows attackers to potentially damage a system's memory. This issue has been fixed in version 3.24.2. We recommend updating to this version to mitigate the risk.
Original title
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 t...
Original description
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.
nvd CVSS3.1
7.5
Vulnerability type
CWE-122
Heap-based Buffer Overflow
CWE-131
Published: 30 Mar 2026 · Updated: 15 Jun 2026 · First seen: 30 Mar 2026