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CVE-2026-41136

5.3 · MEDIUM

free5GC AMF provides Access & Mobility Management Function (AMF) for free5GC, an an open-source project for 5th generation (5G) mobile core networks.

Published Apr 22, 2026free5gcCWE-440EPSS 0.28%

Overview

CVE-2026-41136 is a medium-severity vulnerability affecting free5gc amf. It was published on April 22, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

free5GC AMF provides Access & Mobility Management Function (AMF) for free5GC, an an open-source project for 5th generation (5G) mobile core networks. Prior to version 1.4.3, the `HTTPUEContextTransfer` handler in `internal/sbi/api_communication.go` does not include a `default` case in the `Content-Type` switch statement. When a request arrives with an unsupported `Content-Type`, the deserialization step is silently skipped, `err` remains `nil`, and the processor is invoked with a completely uninitialized `UeContextTransferRequest` object. Version 1.4.3 contains a fix.

Remediation

Check the references section for vendor advisories and patches from free5gc. Update amf 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
free5gcamf>= 0, < 1.4.3Affected
free5gcfree5gc0Affected

References

GitHubgithub.com/free5gc/amf/releases/tag/v1.4.3GitHubgithub.com/free5gc/free5gc/security/advisories/GHSA-r99v-75p9-xqm5GitHubgithub.com/free5gc/free5gc/security/advisories/GHSA-r99v-75p9-xqm5

How CyberStrike helps

Frequently asked questions

What is CVE-2026-41136?

CVE-2026-41136 is a medium-severity vulnerability affecting free5gc amf. It was published on April 22, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-41136?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-41136?

Check the references section for vendor advisories and patches from free5gc. Update amf 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-2026-41136?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-41136 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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