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CVE-2026-44038— Global buffer out-of-bounds read in DCMTK JPEG Huffman decoding

Quick assessment

Affected
OFFIS DCMTK
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 OFFIS DCMTK 3.7.0 捆绑的 IJG JPEG 库（dcmjpeg/libijg8、libijg12 和 libijg16）的哈夫曼解码器中存在一个全局越界读取漏洞。攻击者可以通过构造包含异常哈夫曼表的 DICOM 文件（其哈夫曼表定义的差分类别大于 15），导致读取超出 extend_test[] 和 extend_offset[] 表边界的内存，从而引发像素数据解码错误或程序崩溃。除非在编译 DCMTK 时启用 DCMTK_ENABLE_STRICT_HUFFMAN_TABLE_CHECK 选

CVSS 4.4 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
OFFIS DCMTK 3.7.0 affected
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I. Basic Information for CVE-2026-44038

Vulnerability Information
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Vulnerability Title
Global buffer out-of-bounds read in DCMTK JPEG Huffman decoding
Source: CVE Program / CVE List V5
Vulnerability Description
A global out-of-bounds read in the Huffman decoder of the bundled IJG JPEG libraries (dcmjpeg/libijg8, libijg12 and libijg16) of OFFIS DCMTK 3.7.0 allows an attacker to read memory beyond the extend_test[] and extend_offset[] tables, causing incorrectly decoded pixel data or a crash, via a DICOM file with a crafted JPEG stream whose Huffman table defines a difference category above 15. Huffman symbol values are not range-checked unless DCMTK is built with DCMTK_ENABLE_STRICT_HUFFMAN_TABLE_CHECK, which is disabled by default. dcmdjpeg and any application that decompresses JPEG DICOM images with DCMTK are affected. The issue is fixed in commit d6ae1bc8d5b9ae9c7300013c8c85cc2ea0fd8cf5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
OFFIS DCMTK 3.7.0 cpe:2.3:a:offis:dcmtk:3.7.0:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-44038

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III. Intelligence Information for CVE-2026-44038

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Patches & Fixes for CVE-2026-44038 (2)

Same Patch Batch · OFFIS · 2026-10-08 · 7 CVEs total

CVE-2026-44031 7.5 HIGH Uncontrolled recursion in the DCMTK DICOM dataset parser allows unauthenticated remote den
CVE-2026-44037 5.5 MEDIUM Uncontrolled recursion in DCMTK JSON reader allows denial of service
CVE-2026-44035 5.5 MEDIUM Uncontrolled recursion in DCMTK DICOMDIR parsing allows denial of service
CVE-2026-44036 5.5 MEDIUM Uncontrolled recursion in DCMTK xml2dcm allows denial of service
CVE-2026-44033 5.5 MEDIUM Uncontrolled recursion in the DCMTK bundled XML parser allows denial of service
CVE-2026-44034 4.4 MEDIUM Heap out-of-bounds read in DCMTK RLE decodeFrame()

IV. Related Vulnerabilities

Same product: DCMTK
Same vendor: OFFIS
Same weakness: CWE-125

V. Comments for CVE-2026-44038

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