CVE-2026-4988

Open5GS CCA Message smf_s6b denial of service

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

Open5GS

CVSS v4.0 VULDB

2.9 LOWCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 NVD

5.9 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 VULDB

3.7 LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS v2.0 VULDB

2.6 LOWAV:N/AC:H/Au:N/C:N/I:N/A:P

EPSS

0.73% chance of exploitation in the next 30 days, 54th percentile

Published

2026-03-27

Updated

2026-03-30

Proof-of-concept exploits (1)

• open5gs/open5gs/issues/4342#issue-40217722322770★ · 2026-10-15

Security advisories

• https://vuldb.com/?id.353875
• https://vuldb.com/?submit.771349
• open5gs/open5gs/issues/4342

References

• CVE Record
• NVD entry