CVE-2026-41136

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.

CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS — Exploit Prediction

0.0003

Probability of exploitation

0.10%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-440 CWE-440

Affected Products

Vendor	Product	Versions
free5gc	amf	< 1.4.3
free5gc	free5gc	< 4.2.1

References

Advisories & Patches

https://github.com/free5gc/free5gc/security/advisories/GHSA-r99v-75p9-xqm5 https://github.com/free5gc/free5gc/security/advisories/GHSA-r99v-75p9-xqm5

Exploits

https://github.com/free5gc/free5gc/security/advisories/GHSA-r99v-75p9-xqm5 https://github.com/free5gc/free5gc/security/advisories/GHSA-r99v-75p9-xqm5

Other References

https://github.com/free5gc/amf/releases/tag/v1.4.3

Frequently Asked Questions

What is CVE-2026-41136? +

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. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-41136? +

CVE-2026-41136 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0003, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-41136? +

CVE-2026-41136 affects products from free5gc, specifically: amf, free5gc. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-41136? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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