by Kastro
Paper/Archive/CVE-2026-5442

CVE-2026-5442

Orthanc DICOM Server — Heap Buffer Overflow in DICOM Image Decoder via VR UL Dimensions

EPSS 0.6%CVSS 9.8
critical.is priorityof 100
39
CVSS 9.8 (ADP)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 48.6.486 × 209.7No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
DICOM Server≤ 1.12.10–CNA

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

reforthanc-server.comrefmachinespirits.derefkb.cert.org/vuls/id/536588