CVE-2026-1683 Free5GC SMF PFCP handler.go HandlePfcpSessionReportRequest denial of service
Remote attackers can cause a denial of service in Free5GC SMF via the PFCP handler, requiring a patch for mitigation.
- 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-2026-1683?
CVE-2026-1683 is a medium-severity denial of service vulnerability in Free5gc Free5gc, published on 30 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability has been found in Free5GC SMF up to 4.1.0. Affected by this vulnerability is the function HandlePfcpSessionReportRequest of the file internal/pfcp/handler/handler.go of the component PFCP. The manipulation leads to denial of service. Remote exploitation of the attack is possible. The exploit has been disclosed to the public and may be used. To fix this issue, it is recommended to deploy a patch.
Weakness: CWE-404
Which versions are affected by CVE-2026-1683?
It affects 1 product.
Products include Free5gc Free5gc.
How do I fix CVE-2026-1683?
No fix has been published for CVE-2026-1683 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-1683 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-1683 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-frg8-29h3-wvgf.