Information disclosure in Free5gc
CVE-2026-33192
Free5GC is an open-source Linux Foundation project for 5th generation (5G) mobile core networks. In versions prior to 1.4.2, the UDM incorrectly converts a downstream 400 Bad Request (from UDR) into a 500 Internal Server Error when handling PATCH requests with an empty supi path parameter. Additionally, the UDM incorrectly translates the PATCH method to PUT when forwarding to UDR, indicating a deeper architectural issue. This leaks internal error handling behavior, making it difficult for clients to distinguish between client-side errors and server-side failures. The issue has been patched in version 1.4.2.
Published · last modified .
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:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (31.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 31.8% 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: 0.004 · change: +0.001
Affected products
- Free5gc — versions < 1.4.2
- Free5gc Udm
Weakness classification (CWE)
References
- github.com/free5gc/free5gc/security/advisories/GHSA-5rvc-5cwx-g5x8 (Patch, Vendor Advisory)
- github.com/free5gc/free5gc/issues/784 (Exploit, Patch, Issue Tracking, Vendor Advisory)
- github.com/free5gc/udm/pull/79 (Patch, Issue Tracking)
Frequently asked questions
- What is CVE-2026-33192?
- CVE-2026-33192 is a medium-severity vulnerability in Free5gc, classified under Generation of Error Message Containing Sensitive Information. CVSS score: 5.3/10. Published 2026-03-20.
- How severe is CVE-2026-33192?
- Medium severity. CVSS v3 base score is 5.3 out of 10.