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CVE-2026-5445— Out-of-Bounds Read in DicomImageDecoder (DecodeLookupTable)

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DecodeLookupTable函数存在越界读取，可能导致解码器读取超出分配的查找表内存并将堆内容暴露在输出图像中。

AI Predicted 7.5 Difficulty: Easy EPSS 0.79% · P56
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I. Basic Information for CVE-2026-5445

Vulnerability Information
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Vulnerability Title
Out-of-Bounds Read in DicomImageDecoder (DecodeLookupTable)
Source: CVE Program / CVE List V5
Vulnerability Description
An out-of-bounds read vulnerability exists in the `DecodeLookupTable` function within `DicomImageDecoder.cpp`. The lookup-table decoding logic used for `PALETTE COLOR` images does not validate pixel indices against the lookup table size. Crafted images containing indices larger than the palette size cause the decoder to read beyond allocated lookup table memory and expose heap contents in the output image.
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DecodeLookupTable函数存在越界读取，可能导致解码器读取超出分配的查找表内存并将堆内容暴露在输出图像中。
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-2026-5445

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III. Intelligence Information for CVE-2026-5445

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Vendor Advisories for CVE-2026-5445 (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-2026-5440 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
CVE-2026-5437 Out-of-Bounds Read in DicomStreamReader

IV. Related Vulnerabilities

Same product: DICOM Server
Same vendor: Orthanc

V. Comments for CVE-2026-5445

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