What is CVE-2026-1976?

CVE-2026-1976 is a medium-severity vulnerability in Free5gc, classified under Improper Resource Shutdown or Release. CVSS score: 5.3/10. Published 2026-02-06.

How severe is CVE-2026-1976?

Medium severity. CVSS v3 base score is 5.3 out of 10.

NULL pointer dereference in Free5gc

CVE-2026-1976

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.

EPSS: 0.005 (41.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Free5gc
N/a Free5gc — versions 4.0, 4.1.0

Weakness classification (CWE)

References

cna@vuldb.com (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
cna@vuldb.com (signature, Permissions Required, permissions-required, VDB Entry)
cna@vuldb.com (Exploit, VDB Entry, Third Party Advisory, third-party-advisory)
cna@vuldb.com (issue-tracking, Exploit, Issue Tracking, Vendor Advisory)
cna@vuldb.com (issue-tracking, Exploit, exploit, Issue Tracking, Vendor Advisory)
cna@vuldb.com (issue-tracking, patch, Issue Tracking)
cna@vuldb.com (Product, product)

Frequently asked questions

What is CVE-2026-1976?: CVE-2026-1976 is a medium-severity vulnerability in Free5gc, classified under Improper Resource Shutdown or Release. CVSS score: 5.3/10. Published 2026-02-06.
How severe is CVE-2026-1976?: Medium severity. CVSS v3 base score is 5.3 out of 10.