CVE-2026-33985— FreeRDP: ClearCodec Glyph Cache Count Desync - Heap OOB Read
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I. Basic Information for CVE-2026-33985
Vulnerability Information
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Vulnerability Title
FreeRDP: ClearCodec Glyph Cache Count Desync - Heap OOB Read
Source: NVD (National Vulnerability Database)
Vulnerability Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, pixel data from adjacent heap memory is rendered to screen, potentially leaking sensitive data to the attacker. 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:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨界内存读
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，该漏洞源于将相邻堆内存中的像素数据渲染到屏幕，可能向攻击者泄露敏感数据。
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-2026-33985
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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-2026-33984 | 7.5 HIGH | FreeRDP: ClearCodec resize_vbar_entry() 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-2026-33995 | 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-2026-33984
FreeRDP: ClearCodec resize_vbar_entry() Heap OOB Write
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-2026-33984
FreeRDP: ClearCodec resize_vbar_entry() Heap OOB Write
Same weakness: CWE-125
- CVE-2026-8177
XML::LibXML versions through 2.0210 for Perl read out-of-bou - CVE-2026-6104
Global buffer over-read in mb_convert_encoding() with attack - CVE-2026-7258
Out-of-bounds read in urldecode() on NetBSD - CVE-2026-8186
Open5GS NF client.c ogs_sbi_client_send_via_scp_or_sepp out- - CVE-2026-3508
ASUS System Control Interface 缓冲区错误漏洞
V. Comments for CVE-2026-33985
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