What is CVE-2026-1522?

CVE-2026-1522 is a medium-severity vulnerability in Open5gs, classified under Improper Resource Shutdown or Release. CVSS score: 5.3/10. Published 2026-01-28.

How severe is CVE-2026-1522?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Open5gs

CVE-2026-1522

A weakness has been identified in Open5GS up to 2.7.6. This vulnerability affects the function sgwc_s5c_handle_modify_bearer_response of the file src/sgwc/s5c-handler.c of the component SGWC. Executing a manipulation can lead to denial of service. The attack can be launched remotely. The exploit has been made available to the public and could be used for attacks. This patch is called b19cf6a. Applying a patch is advised to resolve this issue. The issue report is flagged as already-fixed.

Published 2026-01-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.007 (52.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 52.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: +0.001

Affected products

Open5gs
Open5gs — versions 2.7.0, 2.7.1, 2.7.2

Weakness classification (CWE)

CWE-404 — Improper Resource Shutdown or Release

References

vuldb.com/ (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
vuldb.com/ (signature, Permissions Required, permissions-required, VDB Entry)
vuldb.com/ (Exploit, VDB Entry, Third Party Advisory, third-party-advisory)
github.com/open5gs/open5gs/issues/4266 (issue-tracking, Exploit, Patch, Issue Tracking, Vendor Advisory)
github.com/open5gs/open5gs/issues/4266 (issue-tracking, Exploit, Patch, Issue Tracking)
github.com/open5gs/open5gs/issues/4266 (issue-tracking, Exploit, Patch, exploit, Issue Tracking, Vendor Advisory)
github.com/open5gs/open5gs/commit/b19cf6a (Patch, patch)
github.com/open5gs/open5gs/ (product)

Frequently asked questions

What is CVE-2026-1522?: CVE-2026-1522 is a medium-severity vulnerability in Open5gs, classified under Improper Resource Shutdown or Release. CVSS score: 5.3/10. Published 2026-01-28.
How severe is CVE-2026-1522?: Medium severity. CVSS v3 base score is 5.3 out of 10.