Buffer overflow in Open5gs
CVE-2026-78156
A security vulnerability has been detected in Open5GS 2.8.0. Affected by this issue is the function hss_ogs_diam_s6a_air_cb of the file src/hss/hss-s6a-path.c of the component S6a Authentication-Information-Request Handler. Such manipulation of the argument Visited-PLMN-Id leads to heap-based buffer overflow. The attack may be performed from remote. The name of the patch is a9c82ee0b590d76a581b0580cb46b598984e2392. A patch should be applied to remediate this issue.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.006 (44.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.9% 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: 0.006 · change: +0.002
Affected products
- Open5gs — versions 2.8.0
Weakness classification (CWE)
References
- vuldb.com/vuln/394539 (technical-description, vdb-entry)
- vuldb.com/vuln/394539/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-78156 (third-party-advisory)
- vuldb.com/submit/882951 (third-party-advisory)
- github.com/open5gs/open5gs/issues/4661 (issue-tracking)
- github.com/open5gs/open5gs/commit/a9c82ee0b590d76a581b0580cb46b598984e2392 (patch)
- github.com/open5gs/open5gs/ (product)
Frequently asked questions
- What is CVE-2026-78156?
- CVE-2026-78156 is a high-severity vulnerability in Open5gs, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.4/10. Published 2026-08-24.
- How severe is CVE-2026-78156?
- High severity. CVSS v3 base score is 7.4 out of 10.