Auth bypass in Open5gs
CVE-2026-8743
A vulnerability was found in Open5GS up to 2.7.6. This impacts the function ran_ue_find_by_amf_ue_ngap_id of the file src/amf/context.c of the component AMF/MME. Performing a manipulation results in improper authorization. It is possible to initiate the attack remotely. The exploit has been made public and could be used. The patch is named 5746b8576cfceec18ed87eb7d8cf11b1fb4cd8b1. It is suggested to install a patch to address this issue.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.004 (30.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 30.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002
Affected products
- Open5gs
- Open5gs — versions 2.7.0, 2.7.1, 2.7.2
Weakness classification (CWE)
References
- vuldb.com/vuln/364330 (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/vuln/364330/cti (signature, Permissions Required, permissions-required, VDB Entry)
- vuldb.com/submit/814559 (VDB Entry, Third Party Advisory, third-party-advisory)
- github.com/open5gs/open5gs/issues/4498 (issue-tracking, Exploit, exploit, Issue Tracking)
- github.com/open5gs/open5gs/pull/4553 (issue-tracking, Patch, patch, Issue Tracking)
- github.com/open5gs/open5gs/commit/5746b8576cfceec18ed87eb7d8cf11b1fb4cd8b1 (Patch, patch)
- github.com/open5gs/open5gs/ (Product, product)
Frequently asked questions
- What is CVE-2026-8743?
- CVE-2026-8743 is a medium-severity vulnerability in Open5gs, classified under Incorrect Privilege Assignment. CVSS score: 6.3/10. Published 2026-05-17.
- How severe is CVE-2026-8743?
- Medium severity. CVSS v3 base score is 6.3 out of 10.