CVE-2026-33983— FreeRDP: Progressive Codec Quant BYTE Underflow - UB + CPU DoS
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I. Basic Information for CVE-2026-33983
Vulnerability Information
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Vulnerability Title
FreeRDP: Progressive Codec Quant BYTE Underflow - UB + CPU DoS
Source: NVD (National Vulnerability Database)
Vulnerability Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, progressive_decompress_tile_upgrade() detects a mismatch via progressive_rfx_quant_cmp_equal() but only emits WLog_WARN, execution continues. The wrapped value (247) is used as a shift exponent, causing undefined behavior and an approximately 80 billion iteration loop (CPU DoS). This issue has been patched in version 3.24.2.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
整数溢出或超界折返
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progressive_decompress_tile_upgrade函数检测到不匹配后仅发出警告并继续执行，导致使用包装值作为移位指数，可能引发未定义行为和CPU拒绝服务攻击。
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-2026-33983
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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-2026-33985 | 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-190
- CVE-2026-7568
Signed integer overflow in metaphone() - CVE-2026-42311
Pillow: OOB Write with Invalid PSD Tile Extents (Integer Ove - CVE-2026-42308
Pillow: Integer overflow when processing fonts - CVE-2026-6664
PgBouncer integer overflow in PgBouncer network packet parsi - CVE-2026-42199
Grid: Integer Overflow in Grid::expand_rows Leads to Safe-AP
V. Comments for CVE-2026-33983
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