CVE-2026-41136

Name: CVE-2026-41136
Creator: NVD / NIST
Published: 2026-04-22T00:16:29.423+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.28%

Last modified Jun 17, 2026

CVE-2026-41136 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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. EPSS estimates a 0.28% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.3/10

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

CVSS 4.0

5.5/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.28%

19.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-440

Affected Software

Vendor	Product	Versions
Free5gc	Amf	< 1.4.3
Free5gc	Free5gc	<= 4.2.1

References

https://github.com/free5gc/amf/releases/tag/v1.4.3Product, Release Notes
https://github.com/free5gc/free5gc/security/advisories/GHSA-r99v-75p9-xqm5Exploit, Vendor Advisory
https://github.com/free5gc/free5gc/security/advisories/GHSA-r99v-75p9-xqm5Exploit, Vendor Advisory

Timeline

Published: Apr 22, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-41136?

How severe is CVE-2026-41136?

CVE-2026-41136 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.28% probability of exploitation in the next 30 days.

How do I fix CVE-2026-41136?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-41136?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST