CVE-2026-8266 Open5GS SMF gsm-build.c gsm_build_pdu_session_establishment_accept denial of service
Remote attackers can cause a denial of service in Open5GS SMF via the gsm_build_pdu_session_establishment_accept 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-2026-8266?
CVE-2026-8266 is a medium-severity denial of service vulnerability in Open5gs Open5gs, published on 11 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability was detected in Open5GS up to 2.7.7. This affects the function gsm_build_pdu_session_establishment_accept of the file /src/smf/gsm-build.c of the component SMF. The manipulation results in denial of service. The attack can be launched remotely. The exploit is now 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-2026-8266?
It affects 1 product.
Products include Open5gs Open5gs.
How do I fix CVE-2026-8266?
No fix has been published for CVE-2026-8266 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-2026-8266 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-8266 exists.
Other vulnerabilities in Open5gs Open5gs
Sources
Also known as GHSA-cpxg-2cqw-2wjq.