CVE-2026-5661 Free5GC NGSetupRequest denial of service
Remote attackers can cause a denial of service in Free5GC by exploiting the NGSetupRequest handler, requiring a patch to mitigate.
- 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-2026-5661?
CVE-2026-5661 is a medium-severity denial of service vulnerability in Free5GC, published on 6 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability was identified in Free5GC 4.2.0. This affects an unknown function of the component NGSetupRequest Handler. Such manipulation leads to denial of service. The attack may be launched remotely. The exploit is publicly available and might be used.
Weakness: CWE-404
Which versions are affected by CVE-2026-5661?
How do I fix CVE-2026-5661?
No fix has been published for CVE-2026-5661 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-2026-5661 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5661 exists.
Sources
Also known as GHSA-jjpc-rhf2-47c4.