CVE-2026-29776— FreeRDP has an Integer Underflow in update_read_cache_bitmap_order Function of FreeRDP's Core Library
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I. Basic Information for CVE-2026-29776
Vulnerability Information
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Vulnerability Title
FreeRDP has an Integer Underflow in update_read_cache_bitmap_order Function of FreeRDP's Core Library
Source: NVD (National Vulnerability Database)
Vulnerability Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, Integer Underflow in update_read_cache_bitmap_order Function of FreeRDP's Core Library This vulnerability is fixed in 3.24.0.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L
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 3.24.0之前版本存在安全漏洞，该漏洞源于update_read_cache_bitmap_order函数存在整数下溢。
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-2026-29776
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Same Patch Batch · FreeRDP · 2026-03-13 · 8 CVEs total
| CVE-2026-31883 | 6.5 MEDIUM | FreeRDP has a `size_t` underflow in ADPCM decoder leads to heap-buffer-overflow write |
| CVE-2026-31884 | 6.5 MEDIUM | FreeRDP has a division-by-zero in ADPCM decoders when `nBlockAlign` is 0 |
| CVE-2026-31885 | 6.5 MEDIUM | FreeRDP has an out-of-bounds read in ADPCM decoders due to missing predictor/step_index bo |
| CVE-2026-29775 | 5.3 MEDIUM | FreeRDP has a heap-buffer-overflow in bitmap_cache_put via OOB cacheId |
| CVE-2026-29774 | 5.3 MEDIUM | FreeRDP has a heap-buffer-overflow in avc420_yuv_to_rgb via OOB regionRects |
| CVE-2026-31897 | FreeRDP has an out-of-bounds read in `freerdp_bitmap_decompress_planar` | |
| CVE-2026-31806 | FreeRDP has a Heap Buffer Overflow in nsc_process_message() via Unchecked SURFACE_BITS_COM |
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-2026-29776
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