Vulnerability in Open5gs
CVE-2026-7535
A vulnerability was found in Open5GS up to 2.7.7. This affects the function amf_namf_comm_handle_registration_status_update_request in the library /lib/app/ogs-init.c of the file /namf-comm/v1/ue-contexts/{ueContextId}/transfer-update. Performing a manipulation of the argument ueContextId results in denial of service. The attack can be initiated remotely. The exploit has been made public and could be used. The project was informed of the problem early through an issue report but has not responded yet.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.005 (42.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Open5gs — versions 2.7.0, 2.7.1, 2.7.2
Weakness classification (CWE)
References
- vuldb.com/vuln/360352 (technical-description, vdb-entry)
- vuldb.com/vuln/360352/cti (signature, permissions-required)
- vuldb.com/submit/804291 (third-party-advisory)
- vuldb.com/submit/804303 (third-party-advisory)
- github.com/open5gs/open5gs/issues/4399 (issue-tracking, exploit)
- github.com/open5gs/open5gs/ (product)
Frequently asked questions
- What is CVE-2026-7535?
- CVE-2026-7535 is a medium-severity vulnerability in Open5gs, classified under Improper Resource Shutdown or Release. CVSS score: 4.3/10. Published 2026-05-01.
- How severe is CVE-2026-7535?
- Medium severity. CVSS v3 base score is 4.3 out of 10.