Vulnerability in Free5gc
CVE-2026-33062
free5GC is an open source 5G core network. free5GC NRF prior to version 1.4.2 has an Improper Input Validation vulnerability leading to Denial of Service. All deployments of free5GC using the NRF discovery service are affected. The `EncodeGroupId` function attempts to access array indices [0], [1], [2] without validating the length of the split data. When the parameter contains insufficient separator characters, the code panics with "index out of range". A remote attacker can cause the NRF service to panic and crash by sending a crafted HTTP GET request with a malformed `group-id-list` parameter. This results in complete denial of service for the NRF discovery service. free5GC NRF version 1.4.2 fixes the issue. There is no direct workaround at the application level. The recommendation is to apply the provided patch or restrict access to the NRF API to trusted sources only.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.010 (62.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 62.5% 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: 0.010 · change: +0.004
Affected products
- Free5gc
- Free5gc Nrf — versions < 1.4.2
Weakness classification (CWE)
References
- github.com/free5gc/free5gc/security/advisories/GHSA-7c47-xr7q-p6hg (Vendor Advisory)
- github.com/free5gc/free5gc/issues/777 (Exploit, Issue Tracking)
- github.com/free5gc/nrf/pull/80 (Patch)
- github.com/free5gc/nrf/commit/dac77d8f8f2e0f041c5634fb3c685dcb9734b872 (Patch)
Frequently asked questions
- What is CVE-2026-33062?
- CVE-2026-33062 is a high-severity vulnerability in Free5gc, classified under Improper Access Control. CVSS score: 7.5/10. Published 2026-03-20.
- How severe is CVE-2026-33062?
- High severity. CVSS v3 base score is 7.5 out of 10.