High severity · published Feb 6, 2026
CVE-2026-1973
Free5GC SMF establishPfcpSession null pointer dereference
7.5
CVSS
0.6%
EPSS
No
On KEV
Description
A vulnerability was determined in Free5GC up to 4.1.0. The impacted element is the function establishPfcpSession of the component SMF. Executing a manipulation can lead to null pointer dereference. The attack may be launched remotely. The exploit has been publicly disclosed and may be utilized. It is best practice to apply a patch to resolve 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-2026-1973
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-1973
Product
https://github.com/free5gc/free5gc/
Exploit
https://github.com/free5gc/free5gc/issues/815
Exploit
https://github.com/free5gc/free5gc/issues/815#issue-3832032062
Issue Tracking
https://github.com/free5gc/smf/pull/189
Permissions Required
https://vuldb.com/?ctiid.344495
Third Party Advisory
https://vuldb.com/?id.344495
More from Free5GC
10.0
CVE-2026-44327
free5GC: NEF nnef-oam route group is unauthenticated; no-token requests reach the OAM handler
10.0
CVE-2026-44329
free5GC: SMF UPI management interface lacks auth middleware; unauthenticated topology read/write requests reach handlers
10.0
CVE-2026-44330
free5GC: NEF nnef-pfdmanagement API is unauthenticated; forged bearer tokens can read PFD data and create/delete PFD subscriptions
9.4
CVE-2026-44315
free5GC: NEF 3gpp-pfd-management API is unauthenticated; forged bearer tokens can create, read, and delete PFD transactions
9.4
CVE-2026-44326
free5GC: NEF 3gpp-traffic-influence API is unauthenticated; missing or forged bearer tokens can create, read, patch, and delete subscriptions