CVE-2026-1976

Name: CVE-2026-1976
Creator: NVD / NIST
Published: 2026-02-06T03:15:49.503+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.53%

Last modified Jun 17, 2026

CVE-2026-1976 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. A weakness has been identified in Free5GC up to 4.1.0. Affected is the function SessionDeletionResponse of the component SMF. EPSS estimates a 0.53% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

CVSS 4.0

5.5/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.53%

40.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Free5gc	Free5gc	<= 4.1.0

References

https://github.com/free5gc/free5gc/Product
https://github.com/free5gc/free5gc/issues/817Exploit, Issue Tracking, Vendor Advisory
https://github.com/free5gc/free5gc/issues/817#issue-3832188092Exploit, Issue Tracking, Vendor Advisory
https://github.com/free5gc/smf/pull/189Issue Tracking
https://vuldb.com/?ctiid.344498Permissions Required, VDB Entry
https://vuldb.com/?id.344498Third Party Advisory, VDB Entry
https://vuldb.com/?submit.743239Exploit, Third Party Advisory, VDB Entry

Timeline

Published: Feb 6, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-1976?

How severe is CVE-2026-1976?

CVE-2026-1976 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.53% probability of exploitation in the next 30 days.

How do I fix CVE-2026-1976?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-1976?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST