CVE-2026-4988 Open5GS CCA Message smf_s6b denial of service
Remote attackers can cause a denial of service in Open5GS via complex manipulation of CCA message handlers.
- 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-2026-4988?
CVE-2026-4988 is a medium-severity denial of service vulnerability in Open5gs Open5gs, published on 27 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A security flaw has been discovered in Open5GS 2.7.6. This issue affects the function smf_gx_cca_cb/smf_gy_cca_cb/smf_s6b of the component CCA Message Handler. The manipulation results in denial of service. The attack may be launched remotely. Attacks of this nature are highly complex. The exploitability is assessed as difficult. The exploit has been released to the public and may be used for attacks.
Weakness: CWE-404
Which versions are affected by CVE-2026-4988?
It affects 1 product.
Products include Open5gs Open5gs.
How do I fix CVE-2026-4988?
No fix has been published for CVE-2026-4988 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-2026-4988 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4988 exists.
Other vulnerabilities in Open5gs Open5gs
Sources
Also known as GHSA-2678-g677-r4gx.