CVE-2026-5442

Heap Buffer Overflow in DICOM Image Decoder via VR UL Dimensions

Critical · published April 9, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
59.9
In the wild
Unconfirmed
What it is

A heap buffer overflow vulnerability exists in the DICOM image decoder. Dimension fields are encoded using Value Representation (VR) Unsigned Long (UL), instead of the expected VR Unsigned Short (US), which allows extremely large dimensions to be processed. This causes an integer overflow during frame size calculation and results in out-of-bounds memory access during image decoding.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00918 · 59.9th percentile
Published
2026-04-09T14:43Z
EPSS history
Timeline
  • 09 APR 14:43Z
    Heap Buffer Overflow in DICOM Image Decoder via VR UL Dimensions
    cvelistv5