Bug 2547950 (CVE-2026-44034)

Summary: CVE-2026-44034 dcmtk: dcmtk: Information disclosure via crafted RLE DICOM file
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in DCMTK. A heap-based out-of-bounds read vulnerability occurs in the frame decoding routine due to missing length validation on image data fragments. By enticing a user or application to process a specially crafted Run-Length Encoded (RLE) DICOM file, an attacker could trigger an out-of-bounds memory read, leading to information disclosure of adjacent heap memory or causing an application crash that results in a Denial of Service (DoS).
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Bug Depends On: 2548023, 2548025    
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Description OSIDB Bzimport 2026-10-08 13:05:11 UTC 
A heap-based out-of-bounds read in DcmRLECodecDecoder::decodeFrame() in dcmdata/libsrc/dcrleccd.cc of OFFIS DCMTK 3.7.0 allows an attacker to read up to 63 bytes of adjacent heap memory, or cause a crash, via a crafted RLE Lossless DICOM file whose pixel data fragment is shorter than the 64-byte RLE header. The function copies 64 bytes without checking the fragment length, a check that the sibling function decode() already performs. Applications that decode RLE images frame by frame (for example, through DcmPixelData::getUncompressedFrame()) are affected. The dcmdrle command-line tool uses decode() and is not affected. The issue is fixed in commit 45469f3c30037e9c7159290e4bb74cd7b3b9ef1d.