CVE-2026-8121 Open5GS NSSF conv.c ogs_sbi_parse_plmn_list denial of service
Remote attackers can cause a denial of service in Open5GS NSSF via the ogs_sbi_parse_plmn_list function.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-8121?
CVE-2026-8121 is a medium-severity denial of service vulnerability in Open5gs Open5gs, published on 8 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability has been found in Open5GS up to 2.7.7. The impacted element is the function ogs_sbi_parse_plmn_list in the library /lib/sbi/conv.c of the component NSSF. The manipulation leads to denial of service. The attack is possible to be carried out remotely. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.
Weakness: CWE-404
Which versions are affected by CVE-2026-8121?
It affects 1 product.
Products include Open5gs Open5gs.
How do I fix CVE-2026-8121?
No fix has been published for CVE-2026-8121 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-2026-8121 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-8121 exists.
Other vulnerabilities in Open5gs Open5gs
Sources
Also known as GHSA-m782-cq9r-w5vf.