CVE-2026-4988: Open5GS CCA Message smf_s6b denial of service

Severity: medium (CVSS 5.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-03-27 · updated 2026-06-17
Weakness: CWE-404

Description

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: 2.7.6

References

https://github.com/open5gs/open5gs/
https://github.com/open5gs/open5gs/issues/4342
https://github.com/open5gs/open5gs/issues/4342#issue-4021772232
https://vuldb.com/?ctiid.353875
https://vuldb.com/?id.353875
https://vuldb.com/?submit.771349

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