CVE-2026-33984— FreeRDP: ClearCodec resize_vbar_entry() Heap OOB Write
Get alerts for future matching vulnerabilitiesLog in to subscribe
I. Basic Information for CVE-2026-33984
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗ Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
FreeRDP: ClearCodec resize_vbar_entry() Heap OOB Write
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
堆缓冲区溢出
Source: NVD (National Vulnerability Database)
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
II. Public POCs for CVE-2026-33984
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
Qwen3.6-35B-A3B · 14229 chars
Paid plan includes:
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month
III. Intelligence Information for CVE-2026-33984
请登录查看更多情报信息。
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-2026-33952 | FreeRDP: DoS via WINPR_ASSERT in rts_read_auth_verifier_no_checks | |
| CVE-2026-33977 | FreeRDP: DoS via WINPR_ASSERT in IMA ADPCM audio decoder (dsp.c:331) |
IV. Related Vulnerabilities
Same product: FreeRDP
- CVE-2026-40254
FreeRDP: contains_dotdot() off-by-one allows drive channel p - CVE-2026-33995
FreeRDP: Possible double free in kerberos_AcceptSecurityCont - CVE-2026-33987
FreeRDP: Persistent Cache bmpSize Desync - Heap OOB Write - CVE-2026-33986
FreeRDP: H.264 YUV Buffer Dimension Desync - Heap OOB Write - CVE-2026-33985
FreeRDP: ClearCodec Glyph Cache Count Desync - Heap OOB Read
Same vendor: FreeRDP
- CVE-2026-40254
FreeRDP: contains_dotdot() off-by-one allows drive channel p - CVE-2026-33995
FreeRDP: Possible double free in kerberos_AcceptSecurityCont - CVE-2026-33987
FreeRDP: Persistent Cache bmpSize Desync - Heap OOB Write - CVE-2026-33986
FreeRDP: H.264 YUV Buffer Dimension Desync - Heap OOB Write - CVE-2026-33985
FreeRDP: ClearCodec Glyph Cache Count Desync - Heap OOB Read
Same weakness: CWE-122
- CVE-2026-8261
Squirrel sqobject.cpp Load heap-based overflow - CVE-2026-8213
OSGeo gdal Grid File GDapi.c GDSDfldsrch heap-based overflow - CVE-2026-8212
OSGeo gdal SWapi.c SWSDfldsrch heap-based overflow - CVE-2026-42309
Pillow: Heap buffer overflow with nested list coordinates - CVE-2026-45130
Vim: Heap Buffer Overflow in spell file loading
V. Comments for CVE-2026-33984
No comments yet