What is CVE-2026-5438?

CVE-2026-5438 is a high-severity vulnerability in Orthanc Dicom Server, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-04-09.

How severe is CVE-2026-5438?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Orthanc Dicom Server

CVE-2026-5438

A gzip decompression bomb vulnerability exists when Orthanc processes HTTP request with `Content-Encoding: gzip`. The server does not enforce limits on decompressed size and allocates memory based on attacker-controlled compression metadat…

EPSS: 0.005 (38.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Orthanc Dicom Server — versions 0
Orthanc-server Orthanc

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

cret@cert.org (Product)
cret@cert.org (Not Applicable)
cret@cert.org (VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2026-5438?: CVE-2026-5438 is a high-severity vulnerability in Orthanc Dicom Server, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-04-09.
How severe is CVE-2026-5438?: High severity. CVSS v3 base score is 7.5 out of 10.