CVE-2026-1521 Open5GS SGWC s5c-handler.c denial of service
Remote attackers can cause a denial of service in Open5GS SGWC by manipulating bearer resource failure indications, 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-2026-1521?
CVE-2026-1521 is a medium-severity denial of service vulnerability in Open5gs Open5gs, published on 28 Jan 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 up to 2.7.6. This affects the function sgwc_s5c_handle_bearer_resource_failure_indication of the file src/sgwc/s5c-handler.c of the component SGWC. Performing a manipulation results in denial of service. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks. The patch is named 69b53add90a9479d7960b822fc60601d659c328b. It is recommended to apply a patch to fix this issue.
Weakness: CWE-404
Which versions are affected by CVE-2026-1521?
It affects 1 product.
Products include Open5gs Open5gs.
How do I fix CVE-2026-1521?
No fix has been published for CVE-2026-1521 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-2026-1521 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-1521 exists.
Other vulnerabilities in Open5gs Open5gs
Sources
Also known as GHSA-8gqc-w5g5-j344.