High severity · published Feb 6, 2026
CVE-2026-1976
Free5GC SMF SessionDeletionResponse null pointer dereference
7.5
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 49% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FR
Free5GC · Free5gc
4.0; 4.1.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-1976
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-1976
Product
https://github.com/free5gc/free5gc/
Exploit
https://github.com/free5gc/free5gc/issues/817
Exploit
https://github.com/free5gc/free5gc/issues/817#issue-3832188092
Issue Tracking
https://github.com/free5gc/smf/pull/189
Permissions Required
https://vuldb.com/?ctiid.344498
Third Party Advisory
https://vuldb.com/?id.344498
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