High 8.7Published Mar 20, 2026

CVE-2026-33192free5GC UDM incorrectly returns 500 for empty supi path parameter in PATCH sdm-subscriptions reques

Updated under an hour ago (Oct 25, 2026, 11:30 PM ET)

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It affects free5gc and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 8.7 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness (CWE): CWE-209
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Mar 20, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

free5gc free5gc free5gc:free5gc (from the name)	before 1.4.2	CNA record
free5gc udm free5gc:udm	before 1.4.2	NVD

References

https://github.com/free5gc/free5gc/security/advisories/GHSA-5rvc-5cwx-g5x8x-refsource-confirm, patch, vendor-advisory
https://github.com/free5gc/free5gc/issues/784x-refsource-misc, exploit, issue-tracking, patch, vendor-advisory
https://github.com/free5gc/udm/pull/79x-refsource-misc, issue-tracking, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.