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CVE-2026-33984— FreeRDP: ClearCodec resize_vbar_entry() Heap OOB Write

Quick assessment

Affected
FreeRDP FreeRDP
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreeRDP是FreeRDP团队的一款开源的远程桌面协议（RDP）的实现。 FreeRDP 3.24.2之前版本存在安全漏洞，该漏洞源于resize_vbar_entry函数中在重新分配内存前更新size，如果重新分配失败，可能导致堆缓冲区溢出。

CVSS 7.5 · High EPSS 0.40% · P33

Affected Version Matrix 1

VendorProduct Version RangeStatus
FreeRDP FreeRDP < 3.24.2 affected
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I. Basic Information for CVE-2026-33984

Vulnerability Information
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Vulnerability Title
FreeRDP: ClearCodec resize_vbar_entry() Heap OOB Write
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
FreeRDP 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeRDP是FreeRDP团队的一款开源的远程桌面协议（RDP）的实现。 FreeRDP 3.24.2之前版本存在安全漏洞，该漏洞源于resize_vbar_entry函数中在重新分配内存前更新size，如果重新分配失败，可能导致堆缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeRDP FreeRDP < 3.24.2 -

II. Public POCs for CVE-2026-33984

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 14229 chars
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III. Intelligence Information for CVE-2026-33984

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Patches & Fixes for CVE-2026-33984 (1)

Vendor Advisories for CVE-2026-33984 (1)

Same Patch Batch · FreeRDP · 2026-03-30 · 9 CVEs total

CVE-2026-33986 7.5 HIGH FreeRDP: H.264 YUV Buffer Dimension Desync - Heap OOB Write
CVE-2026-33982 7.1 HIGH FreeRDP: Persistent Cache Allocator Mismatch - Heap OOB Read
CVE-2026-33987 7.1 HIGH FreeRDP: Persistent Cache bmpSize Desync - Heap OOB Write
CVE-2026-33983 6.5 MEDIUM FreeRDP: Progressive Codec Quant BYTE Underflow - UB + CPU DoS
CVE-2026-33985 5.9 MEDIUM FreeRDP: ClearCodec Glyph Cache Count Desync - Heap OOB Read
CVE-2026-33995 5.3 MEDIUM FreeRDP: Possible double free in kerberos_AcceptSecurityContext
CVE-2026-33977 FreeRDP: DoS via WINPR_ASSERT in IMA ADPCM audio decoder (dsp.c:331)
CVE-2026-33952 FreeRDP: DoS via WINPR_ASSERT in rts_read_auth_verifier_no_checks

IV. Related Vulnerabilities

Same product: FreeRDP
Same vendor: FreeRDP
Same weakness: CWE-122

V. Comments for CVE-2026-33984

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