CVE-2026-4531 | Free5GC 4.1.0 AMF internal/gmm/handler.go HandleRegistrationComplete denial of service (Issue 792)

VDB-352319 · CVE-2026-4531 · ISSUE 792 FREE5GC 4.1.0 AMF INTERNAL/GMM/HANDLER.GO HANDLEREGISTRATIONCOMPLETE DENIAL OF SERVICE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.1 $0-$5k 1.86 Summaryinfo A vulnerability identified as problematic has been detected in Free5GC 4.1.0. Affected by this vulnerability is the function HandleRegistrationComplete of the file internal/gmm/handler.go of the component AMF. The manipulation leads to denial of service. This vulnerability is traded as CVE-2026-4531. It is possible to initiate the attack remotely. There is no exploit available. It is recommended to apply a patch to fix this issue. Detailsinfo A vulnerability was found in Free5GC 4.1.0 and classified as problematic. This issue affects the function HandleRegistrationComplete of the file internal/gmm/handler.go of the component AMF. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-4531. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK. Applying the patch 52e9386401ce56ea773c5aa587d4cdf7d53da799 is able to eliminate this problem. The bugfix is ready for download at github.com. Productinfo Name Free5GC Version 4.1.0 License open-source Website Product: https://github.com/free5gc/free5gc/ CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 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 Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Denial of service CWE: CWE-404 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Patch Status: 🔍 0-Day Time: 🔒 Patch: 52e9386401ce56ea773c5aa587d4cdf7d53da799 Timelineinfo 03/21/2026 Advisory disclosed 03/21/2026 +0 days VulDB entry created 03/21/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: 792 Status: Confirmed Confirmation: 🔒 CVE: CVE-2026-4531 (🔒) GCVE (CVE): GCVE-0-2026-4531 GCVE (VulDB): GCVE-100-352319 Entryinfo Created: 03/21/2026 08:52 Changes: 03/21/2026 08:52 (57) Complete: 🔍 Submitter: shovon0203 Cache ID: 99:DE2:101 Submitinfo Accepted Submit #774073: Linux Foundation free5GC 4.1.0 Denial of Service (by shovon0203) Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸