CVE-2026-33192

HIGH EPSS 23.8%
Published Mar 20, 20263mo ago · Modified Jun 17, 20261w ago
8.7 CVSS 4.0
High
Find Similar
Published Mar 20, 2026 3mo ago
Last Modified Jun 17, 2026 1w ago

Description

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 Details

Base Score
8.7
Exploitability
—
Impact
—
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
23.8% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-209

Affected Products 1

VendorProductVersionRange
free5gcudm* <1.4.2

References 3

  • github.com https://github.com/free5gc/free5gc/issues/784
    ExploitIssue TrackingPatchVendor Advisory
  • github.com https://github.com/free5gc/free5gc/security/advisories/GHSA-5rvc-5cwx-g5x8
    PatchVendor Advisory
  • github.com https://github.com/free5gc/udm/pull/79
    Issue TrackingPatch

Remediation

  • github.com https://github.com/free5gc/free5gc/issues/784
    ExploitIssue TrackingPatchVendor Advisory
  • github.com https://github.com/free5gc/free5gc/security/advisories/GHSA-5rvc-5cwx-g5x8
    PatchVendor Advisory
  • github.com https://github.com/free5gc/udm/pull/79
    Issue TrackingPatch