What’s Vulnerable › Vulnerabilities

CVE-2026-4531: Free5GC AMF handler.go HandleRegistrationComplete denial of service

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-22 · updated 2026-06-17
• Weakness: CWE-404

Description

A weakness has been identified in Free5GC 4.1.0. Affected is the function HandleRegistrationComplete of the file internal/gmm/handler.go of the component AMF. Executing a manipulation can lead to denial of service. The attack may be performed from remote. This patch is called 52e9386401ce56ea773c5aa587d4cdf7d53da799. It is best practice to apply a patch to resolve this issue.

Affected products

• free5gc: 4.1.0

References

• https://github.com/free5gc/amf/commit/52e9386401ce56ea773c5aa587d4cdf7d53da799
• https://github.com/free5gc/amf/pull/198
• https://github.com/free5gc/free5gc/
• https://github.com/free5gc/free5gc/issues/792
• https://vuldb.com/?ctiid.352319
• https://vuldb.com/?id.352319
• https://vuldb.com/?submit.774073
• https://github.com/free5gc/free5gc/issues/792

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