CVE-2026-1976
Free5GC SMF SessionDeletionResponse null pointer dereference
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.
INFO
Published Date :
Feb. 6, 2026, 3:15 a.m.
Last Modified :
Feb. 9, 2026, 3:04 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Install the vendor patch for Free5GC.
- Update Free5GC to a non-vulnerable version.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-1976.
| URL | Resource |
|---|---|
| https://github.com/free5gc/free5gc/ | Product |
| https://github.com/free5gc/free5gc/issues/817 | ExploitIssue TrackingVendor Advisory |
| https://github.com/free5gc/free5gc/issues/817#issue-3832188092 | ExploitIssue TrackingVendor Advisory |
| https://github.com/free5gc/smf/pull/189 | Issue Tracking |
| https://vuldb.com/?ctiid.344498 | Permissions RequiredVDB Entry |
| https://vuldb.com/?id.344498 | Third Party AdvisoryVDB Entry |
| https://vuldb.com/?submit.743239 | ExploitThird Party AdvisoryVDB Entry |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-1976 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-1976
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-1976 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-1976 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Feb. 09, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-476 Added CPE Configuration OR *cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:* versions up to (including) 4.1.0 Added Reference Type VulDB: https://github.com/free5gc/free5gc/ Types: Product Added Reference Type VulDB: https://github.com/free5gc/free5gc/issues/817 Types: Exploit, Issue Tracking, Vendor Advisory Added Reference Type VulDB: https://github.com/free5gc/free5gc/issues/817#issue-3832188092 Types: Exploit, Issue Tracking, Vendor Advisory Added Reference Type VulDB: https://github.com/free5gc/smf/pull/189 Types: Issue Tracking Added Reference Type VulDB: https://vuldb.com/?ctiid.344498 Types: Permissions Required, VDB Entry Added Reference Type VulDB: https://vuldb.com/?id.344498 Types: Third Party Advisory, VDB Entry Added Reference Type VulDB: https://vuldb.com/?submit.743239 Types: Exploit, Third Party Advisory, VDB Entry -
New CVE Received by [email protected]
Feb. 06, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 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 Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Added CVSS V2 (AV:N/AC:L/Au:N/C:N/I:N/A:P) Added CWE CWE-476 Added CWE CWE-404 Added Reference https://github.com/free5gc/free5gc/ Added Reference https://github.com/free5gc/free5gc/issues/817 Added Reference https://github.com/free5gc/free5gc/issues/817#issue-3832188092 Added Reference https://github.com/free5gc/smf/pull/189 Added Reference https://vuldb.com/?ctiid.344498 Added Reference https://vuldb.com/?id.344498 Added Reference https://vuldb.com/?submit.743239