CVE-2026-7535 Open5GS transfer-update denial of service
Remote attackers can cause denial of service in Open5GS by manipulating the ueContextId argument in the transfer-update endpoint.
- 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-2026-7535?
CVE-2026-7535 is a medium-severity denial of service vulnerability in Open5GS, published on 1 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability was found in Open5GS up to 2.7.7. This affects the function amf_namf_comm_handle_registration_status_update_request in the library /lib/app/ogs-init.c of the file /namf-comm/v1/ue-contexts/{ueContextId}/transfer-update. Performing a manipulation of the argument ueContextId results in denial of service. The attack can be initiated remotely. The exploit has been made public and could 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-2026-7535?
How do I fix CVE-2026-7535?
No fix has been published for CVE-2026-7535 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-2026-7535 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-7535 exists.
Sources
Also known as GHSA-x3q3-9p69-qvgq.