free5gc up to 1.4.2 AMF api_communication.go HTTPUEContextTransfer expected behavior violation

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability was found in free5gc up to 1.4.2 and classified as problematic. This vulnerability affects the function HTTPUEContextTransfer of the file internal/sbi/api_communication.go of the component AMF. The manipulation results in expected behavior violation. This vulnerability is cataloged as CVE-2026-41136. The attack may be launched remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in free5gc up to 1.4.2. Affected is the function HTTPUEContextTransfer of the file internal/sbi/api_communication.go of the component AMF. The manipulation with an unknown input leads to a expected behavior violation vulnerability. CWE is classifying the issue as CWE-440. A feature, API, or function does not perform according to its specification. This is going to have an impact on integrity. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-41136 since 04/17/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit.

Upgrading to version 1.4.3 eliminates this vulnerability. The upgrade is hosted for download at github.com.

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Productinfo

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Expected behavior violation
CWE: CWE-440 / CWE-436
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: free5gc 1.4.3

Timelineinfo

04/17/2026 CVE reserved
04/22/2026 +5 days Advisory disclosed
04/22/2026 +0 days VulDB entry created
04/22/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-r99v-75p9-xqm5
Status: Confirmed

CVE: CVE-2026-41136 (🔒)
GCVE (CVE): GCVE-0-2026-41136
GCVE (VulDB): GCVE-100-358614

Entryinfo

Created: 04/22/2026 06:25
Changes: 04/22/2026 06:25 (69)
Complete: 🔍
Cache ID: 216::103

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