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CVE-2026-41136 - Vulnerability Analysis

MediumCVSS: 5.3

Last Updated: April 23, 2026

free5GC AMF - Insecure Deserialization

Published: April 22, 2026Updated: April 23, 2026PoC AvailableRemote Exploitable

Overview

free5GC AMF < 1.4.3 contains an insecure deserialization caused by missing default case in Content-Type switch in HTTPUEContextTransfer handler, letting attackers send unsupported Content-Type to bypass deserialization, exploit requires crafted request.

Severity & Score

Severity: Medium

CVSS Score: 5.3

Impact

Attackers can bypass deserialization checks, potentially causing logic errors or unexpected behavior in processing uninitialized data.

Mitigation

Update to version 1.4.3 or later.

References

https://github.com/free5gc/amf/releases/tag/v1.4.3
https://github.com/free5gc/free5gc/security/advisories/GHSA-r99v-75p9-xqm5

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Details

CVE ID: CVE-2026-41136
Severity: Medium
CVSS Score: 5.3
Type: insecure_deserialization
Status: confirmed

CWE

CWE-440

CVSS Metrics

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