CVE-2026-4988: OPEN5GS

Medium severity, CVSS 5.9. EPSS: 0.7% chance of exploitation in the next 30 days.

A security flaw has been discovered in Open5GS 2.7.6. This issue affects the function smf_gx_cca_cb/smf_gy_cca_cb/smf_s6b of the component CCA Message Handler. The manipulation results in denial of service. The attack may be launched remotely. Attacks of this nature are highly complex. The exploitability is assessed as difficult. The exploit has been released to the public and may be used for attacks.

Affected products

• OPEN5GS OPEN5GS: version 2.7.6 only

Published 2026-03-27. Last modified 2026-06-17.