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CVE-2026-5437— Out-of-Bounds Read in DicomStreamReader

Quick assessment

Affected
Orthanc DICOM Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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DicomStreamReader在解析DICOM元标头时存在越界读取，可能导致解析器读取超出分配的元数据缓冲区边界。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.76% · P55

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-5437

Vulnerability Information
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Vulnerability Title
Out-of-Bounds Read in DicomStreamReader
Source: CVE Program / CVE List V5
Vulnerability Description
An out-of-bounds read vulnerability exists in `DicomStreamReader` during DICOM meta-header parsing. When processing malformed metadata structures, the parser may read beyond the bounds of the allocated metadata buffer. Although this issue does not typically crash the server or expose data directly to the attacker, it reflects insufficient input validation in the parsing logic.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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DicomStreamReader在解析DICOM元标头时存在越界读取，可能导致解析器读取超出分配的元数据缓冲区边界。
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-2026-5437

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III. Intelligence Information for CVE-2026-5437

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Vendor Advisories for CVE-2026-5437 (1)

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-2026-5439 Memory Exhaustion via Forged ZIP Metadata

IV. Related Vulnerabilities

Same product: DICOM Server
Same vendor: Orthanc

V. Comments for CVE-2026-5437

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