Is CVE-2026-5438 actively exploited?

CVE-2026-5438 has no public evidence of in-the-wild exploitation as of 2026-04-15.

What is the CVSS score for CVE-2026-5438?

CVE-2026-5438 has a CVSS score of 7.5 (HIGH severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

How do I patch CVE-2026-5438?

Patch guidance is available from orthanc-server security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-5438.

Which products are affected by CVE-2026-5438?

1 product: orthanc-server orthanc.

Fix CVE-2026-5438 - HIGH orthanc-server orthanc

Description

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 metadata. A specially crafted gzip payload can trigger excessive memory allocation and exhaust system memory.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: none
Integrity: none
Availability: high
Weaknesses: CWE-770

Metadata

Primary Vendor: ORTHANC-SERVER
Published: 4/9/2026
Last Modified: 4/15/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2026-5438

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary