CVE-2026-5438
7.5 · HIGHOverview
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
| Vendor | Product | Versions | Status |
|---|---|---|---|
| orthanc-server | orthanc | >= 0, < 1.12.11 | Affected |
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's AI-powered security agents can automatically detect CVE-2026-5438 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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