CVE-2026-5439— Memory Exhaustion via Forged ZIP Metadata
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I. Basic Information for CVE-2026-5439
Vulnerability Information
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Vulnerability Title
Memory Exhaustion via Forged ZIP Metadata
Source: NVD (National Vulnerability Database)
Vulnerability Description
A memory exhaustion vulnerability exists in ZIP archive processing. Orthanc automatically extracts ZIP archives uploaded to certain endpoints and trusts metadata fields describing the uncompressed size of archived files. An attacker can craft a small ZIP archive containing a forged size value, causing the server to allocate extremely large buffers during extraction.
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，该漏洞源于处理ZIP存档时存在内存耗尽漏洞，可能导致服务器在提取期间分配极大的缓冲区。
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-2026-5439
| # | 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-2026-5443 | Heap Buffer Overflow in DICOM Image Decoder (Palette Color Decode) | |
| CVE-2026-5438 | Gzip Decompression Bomb via Content-Encoding Header | |
| CVE-2026-5437 | Out-of-Bounds Read in DicomStreamReader |
IV. Related Vulnerabilities
Same product: DICOM Server
- 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 - CVE-2026-5443
Heap Buffer Overflow in DICOM Image Decoder (Palette Color D
Same vendor: Orthanc
- 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 - CVE-2026-5443
Heap Buffer Overflow in DICOM Image Decoder (Palette Color D
V. Comments for CVE-2026-5439
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