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CVE-2026-5438

7.5 · HIGH

A gzip decompression bomb vulnerability exists when Orthanc processes HTTP request with `Content-Encoding: gzip`.

Published Apr 9, 2026orthanc-serverCWE-770EPSS 0.48%

Overview

CVE-2026-5438 is a high-severity vulnerability affecting orthanc-server orthanc. It was published on April 9, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from orthanc-server. Update orthanc to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
orthanc-serverorthanc>= 0, < 1.12.11Affected

References

Refkb.cert.org/vuls/id/536588Refwww.machinespirits.de/Refwww.orthanc-server.com/

How CyberStrike helps

Frequently asked questions

What is CVE-2026-5438?

CVE-2026-5438 is a high-severity vulnerability affecting orthanc-server orthanc. It was published on April 9, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-5438?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-5438?

Check the references section for vendor advisories and patches from orthanc-server. Update orthanc to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-5438?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-5438 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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