CVE-2026-1976 Details
Description
A weakness has been identified in Free5GC up to 4.1.0. Affected is the function SessionDeletionResponse of the component SMF. This manipulation causes null pointer dereference. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks. It is suggested to install a patch to address this issue.
A null pointer dereference vulnerability has been identified in Free5GC versions through 4.1.0, specifically within the Session Deletion Response function of the SMF component. This vulnerability allows a rogue or malicious UPF to cause a denial-of-service condition by responding to a PFCP Session Deletion Request with a malformed Session Deletion Response that omits the required Cause Information Element. As a result, the SMF fails to perform a proper nil-check, leading to a runtime panic that crashes the SMF process. The vulnerability can be exploited remotely, without any authentication.
Users are advised to update to Free5GC version 4.2.0 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Feb 6, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/free5gc/free5gc/ | [email protected] | Product |
| https://github.com/free5gc/free5gc/issues/817 | [email protected] | ExploitIssue TrackingVendor Advisory |
| https://github.com/free5gc/free5gc/issues/817#issue-3832188092 | [email protected] | ExploitIssue TrackingVendor Advisory |
| https://github.com/free5gc/smf/pull/189 | [email protected] | Issue Tracking |
| https://vuldb.com/?ctiid.344498 | [email protected] | Permissions RequiredVDB Entry |
| https://vuldb.com/?id.344498 | [email protected] | Third Party AdvisoryVDB Entry |
| https://vuldb.com/?submit.743239 | [email protected] | ExploitThird Party AdvisoryVDB Entry |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-476 | NULL Pointer Dereference | [email protected] |
| CWE-404 | Improper Resource Shutdown or Release | [email protected] |
| CWE-476 | NULL Pointer Dereference | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| free5gc free5gc | <= 4.1.0 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Feb 9, 2026 | Initial Analysis | [email protected] |
| Feb 6, 2026 | New CVE Received | [email protected] |