CVE-2026-5445: CWE-125 Out-of-bounds Read in Orthanc DICOM Server
CVE-2026-5445 is an out-of-bounds read vulnerability in the Orthanc DICOM Server's DecodeLookupTable function. The vulnerability occurs because the decoder does not validate pixel indices against the size of the palette lookup table when processing PALETTE COLOR images. This flaw allows crafted images with indices larger than the palette size to cause reads beyond allocated memory, potentially exposing heap contents in the output image. There is no CVSS score or vendor advisory indicating a patch or mitigation at this time.
AI Analysis
Technical Summary
This vulnerability involves an out-of-bounds read (CWE-125) in the DecodeLookupTable function of Orthanc DICOM Server's DicomImageDecoder.cpp. Specifically, the lookup-table decoding logic for PALETTE COLOR images fails to validate pixel indices against the lookup table size, allowing an attacker to craft images that trigger reads beyond the allocated lookup table memory. This can lead to exposure of heap memory contents in the decoded image output. The vulnerability affects Orthanc DICOM Server versions indicated as '0' (likely meaning all or unspecified versions). No CVSS score or remediation information is currently available, and no known exploits are reported in the wild.
Potential Impact
Successful exploitation of this vulnerability can lead to disclosure of heap memory contents through the output image, potentially exposing sensitive information. There is no indication of code execution or denial of service from the provided data. No known exploits are currently reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory at https://kb.cert.org/vuls/id/536588 for current remediation guidance. No official fix or workaround is currently documented. Users should monitor the vendor advisory for updates and avoid processing untrusted PALETTE COLOR images until a fix is available.
CVE-2026-5445: CWE-125 Out-of-bounds Read in Orthanc DICOM Server
Description
CVE-2026-5445 is an out-of-bounds read vulnerability in the Orthanc DICOM Server's DecodeLookupTable function. The vulnerability occurs because the decoder does not validate pixel indices against the size of the palette lookup table when processing PALETTE COLOR images. This flaw allows crafted images with indices larger than the palette size to cause reads beyond allocated memory, potentially exposing heap contents in the output image. There is no CVSS score or vendor advisory indicating a patch or mitigation at this time.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves an out-of-bounds read (CWE-125) in the DecodeLookupTable function of Orthanc DICOM Server's DicomImageDecoder.cpp. Specifically, the lookup-table decoding logic for PALETTE COLOR images fails to validate pixel indices against the lookup table size, allowing an attacker to craft images that trigger reads beyond the allocated lookup table memory. This can lead to exposure of heap memory contents in the decoded image output. The vulnerability affects Orthanc DICOM Server versions indicated as '0' (likely meaning all or unspecified versions). No CVSS score or remediation information is currently available, and no known exploits are reported in the wild.
Potential Impact
Successful exploitation of this vulnerability can lead to disclosure of heap memory contents through the output image, potentially exposing sensitive information. There is no indication of code execution or denial of service from the provided data. No known exploits are currently reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory at https://kb.cert.org/vuls/id/536588 for current remediation guidance. No official fix or workaround is currently documented. Users should monitor the vendor advisory for updates and avoid processing untrusted PALETTE COLOR images until a fix is available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- certcc
- Date Reserved
- 2026-04-02T19:23:30.637Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://kb.cert.org/vuls/id/536588","vendor":"CERT"}]
Threat ID: 69d7bcce1cc7ad14dad7b704
Added to database: 4/9/2026, 2:50:54 PM
Last enriched: 4/9/2026, 3:05:52 PM
Last updated: 4/9/2026, 4:18:22 PM
Views: 4
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