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CVE-2026-5443: CWE-190 Integer Overflow or Wraparound in Orthanc DICOM Server

0
High
VulnerabilityCVE-2026-5443cvecve-2026-5443cwe-190
Published: Thu Apr 09 2026 (04/09/2026, 14:43:15 UTC)
Source: CVE Database V5
Vendor/Project: Orthanc
Product: DICOM Server

Description

CVE-2026-5443 is a heap buffer overflow vulnerability in the Orthanc DICOM Server affecting the decoding of PALETTE COLOR DICOM images. The vulnerability arises because pixel length validation uses 32-bit multiplication for width and height, which can overflow and cause the validation to incorrectly succeed. This allows the decoder to read and write beyond allocated memory buffers. There is no CVSS score or official vendor remediation information currently available. No known exploits in the wild have been reported.

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 04/09/2026, 15:05:59 UTC

Technical Analysis

This vulnerability involves an integer overflow (CWE-190) during the decoding process of PALETTE COLOR DICOM images in the Orthanc DICOM Server. The multiplication of width and height values for pixel length validation uses 32-bit arithmetic, which can overflow and bypass validation checks. This leads to a heap buffer overflow, enabling out-of-bounds memory access during image decoding. The issue affects version 0 of the product, with no patch or official remediation level published yet. The vendor advisory from CERT is available but does not specify a fix or mitigation.

Potential Impact

Successful exploitation could result in a heap buffer overflow, potentially allowing an attacker to cause a denial of service or execute arbitrary code within the context of the Orthanc DICOM Server process. However, no known exploits have been reported, and the exact impact depends on exploitation feasibility and environment.

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory at https://kb.cert.org/vuls/id/536588 for current remediation guidance. Until an official fix is released, cautious handling of untrusted PALETTE COLOR DICOM images is advised. No vendor-provided mitigation or temporary fix is currently documented.

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Technical Details

Data Version
5.2
Assigner Short Name
certcc
Date Reserved
2026-04-02T19:23:06.757Z
Cvss Version
null
State
PUBLISHED
Remediation Level
null
Vendor Advisory Urls
[{"url":"https://kb.cert.org/vuls/id/536588","vendor":"CERT"}]

Threat ID: 69d7bcce1cc7ad14dad7b6fa

Added to database: 4/9/2026, 2:50:54 PM

Last enriched: 4/9/2026, 3:05:59 PM

Last updated: 4/9/2026, 4:13:08 PM

Views: 5

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