CVE-2026-5443— Heap Buffer Overflow in DICOM Image Decoder (Palette Color Decode)
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I. Basic Information for CVE-2026-5443
Vulnerability Information
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Vulnerability Title
Heap Buffer Overflow in DICOM Image Decoder (Palette Color Decode)
Source: NVD (National Vulnerability Database)
Vulnerability Description
A heap buffer overflow vulnerability exists during the decoding of `PALETTE COLOR` DICOM images. Pixel length validation uses 32-bit multiplication for width and height calculations. If these values overflow, the validation check incorrectly succeeds, allowing the decoder to read and write to memory beyond allocated buffers.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Orthanc 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Orthanc是Orthanc公司的一款免费的开源软件。 Orthanc存在安全漏洞，该漏洞源于解码PALETTE COLOR DICOM图像时存在堆缓冲区溢出，可能导致验证检查错误通过并允许解码器读取和写入超出分配的缓冲区。
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 |
|---|---|---|---|---|
| Orthanc | DICOM Server | 0 ~ 1.12.10 | - |
II. Public POCs for CVE-2026-5443
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Orthanc · 2026-04-09 · 9 CVEs total
| CVE-2026-5444 | Heap Buffer Overflow in PAM Image Buffer Allocation | |
| CVE-2026-5442 | Heap Buffer Overflow in DICOM Image Decoder via VR UL Dimensions | |
| CVE-2026-5441 | Out-of-Bounds Read in DicomImageDecoder (PMSCT_RLE1 Decompression) | |
| CVE-2026-5445 | Out-of-Bounds Read in DicomImageDecoder (DecodeLookupTable) | |
| CVE-2026-5440 | Memory Exhaustion via Unbounded Content-Length | |
| CVE-2026-5438 | Gzip Decompression Bomb via Content-Encoding Header | |
| CVE-2026-5439 | Memory Exhaustion via Forged ZIP Metadata | |
| CVE-2026-5437 | Out-of-Bounds Read in DicomStreamReader |
IV. Related Vulnerabilities
Same product: DICOM Server
- CVE-2026-5439
Memory Exhaustion via Forged ZIP Metadata - CVE-2026-5437
Out-of-Bounds Read in DicomStreamReader - CVE-2026-5438
Gzip Decompression Bomb via Content-Encoding Header - CVE-2026-5440
Memory Exhaustion via Unbounded Content-Length - CVE-2026-5442
Heap Buffer Overflow in DICOM Image Decoder via VR UL Dimens
Same vendor: Orthanc
- CVE-2026-5439
Memory Exhaustion via Forged ZIP Metadata - CVE-2026-5437
Out-of-Bounds Read in DicomStreamReader - CVE-2026-5438
Gzip Decompression Bomb via Content-Encoding Header - CVE-2026-5440
Memory Exhaustion via Unbounded Content-Length - CVE-2026-5442
Heap Buffer Overflow in DICOM Image Decoder via VR UL Dimens
V. Comments for CVE-2026-5443
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