Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-10-08T12:55:09 dcmtk: dcmtk: Information disclosure via crafted RLE DICOM file 4.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L CWE-125

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.

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).

This vulnerability is rated as Moderate impact because exploitation requires a user or application to process an untrusted medical image file, limiting the outcome to bounded heap memory disclosure or a process crash rather than arbitrary code execution. Standard command-line utilities within the package avoid the defective code path, which is primarily exposed to custom applications that perform frame-by-frame RLE decoding. Furthermore, DCMTK is not included in core Red Hat Enterprise Linux releases and is maintained only in community repositories. https://www.cve.org/CVERecord?id=CVE-2026-44034 https://nvd.nist.gov/vuln/detail/CVE-2026-44034 https://github.com/DCMTK/dcmtk/commit/45469f3c30037e9c7159290e4bb74cd7b3b9ef1d https://support.dcmtk.org/redmine/issues/1213