CVE-2026-78186 Open5GS HSS hss-cx-path.c assertion
Remote attackers can cause a denial of service in Open5GS HSS by triggering a reachable assertion via a manipulated User-Name argument.
- 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-2026-78186?
CVE-2026-78186 is a medium-severity denial of service vulnerability in Open5GS, published on 24 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A flaw has been found in Open5GS up to 2.8.0. This affects an unknown function of the file src/hss/hss-cx-path.c of the component HSS. This manipulation of the argument User-Name causes reachable assertion. The attack is possible to be carried out remotely. The exploit has been published and may be used. Patch name: c9abe09421eb99bbf1cd7862a3d375e58a4eb9e4. It is recommended to apply a patch to fix this issue.
Weakness: CWE-617
Which versions are affected by CVE-2026-78186?
How do I fix CVE-2026-78186?
No fix has been published for CVE-2026-78186 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-2026-78186 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-78186 exists.
Sources
Also known as GHSA-x497-rqwr-7qm2.