CVE-2026-1976 Free5GC SMF SessionDeletionResponse null pointer dereference
Remote attackers can cause a denial of service in Free5GC SMF via a null pointer dereference in SessionDeletionResponse, requiring a patch.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-1976?
CVE-2026-1976 is a medium-severity vulnerability in Free5gc Free5gc, published on 6 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-1976?
It affects 1 product.
Products include Free5gc Free5gc.
How do I fix CVE-2026-1976?
No fix has been published for CVE-2026-1976 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-1976 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-1976 exists.
Other vulnerabilities in Free5gc Free5gc
- CVE-2026-44327 free5GC: NEF nnef-oam route group is unauthenticated; no-token requests reach the OAM handler
- CVE-2026-44329 free5GC's SMF UPI management interface lacks auth middleware; unauthenticated topology read/write requests reach handlers
- CVE-2026-44330 free5GC's NEF nnef-pfdmanagement API is unauthenticated; forged bearer tokens can read PFD data and create/delete PFD subscriptions
- CVE-2025-63679 Memory corruption in n/a
- CVE-2026-44315 free5GC's NEF 3gpp-pfd-management API is unauthenticated; forged bearer tokens can create, read, and delete PFD transactions
Sources
Also known as GHSA-5h25-r5h3-xwpw.