Buffer overflow in Open5gs
CVE-2026-8746
A security flaw has been discovered in Open5GS up to 2.7.7. Affected by this issue is the function discover_handler in the library /lib/sbi/nghttp2-server.c of the component NRF. The manipulation results in use after free. The attack can be launched remotely. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.
Vulnerability class: Buffer Overflow
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: 0.007 (49.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.007 · change: +0.003
Affected products
- Open5gs
- Open5gs — versions 2.7.0, 2.7.1, 2.7.2
Weakness classification (CWE)
References
- github.com/open5gs/open5gs/ (Product, product)
- github.com/open5gs/open5gs/issues/4476 (issue-tracking, Exploit, exploit, Issue Tracking)
- vuldb.com/submit/817032 (VDB Entry, Third Party Advisory, third-party-advisory)
- vuldb.com/vuln/364333 (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/vuln/364333/cti (signature, Permissions Required, permissions-required, VDB Entry)
Frequently asked questions
- What is CVE-2026-8746?
- CVE-2026-8746 is a medium-severity vulnerability in Open5gs, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 4.3/10. Published 2026-05-17.
- How severe is CVE-2026-8746?
- Medium severity. CVSS v3 base score is 4.3 out of 10.