CVE-2026-33064

HIGH EPSS 38.2%
Published Mar 20, 20263mo ago · Modified Mar 23, 20263mo ago
8.7 CVSS 4.0
High
Find Similar
Published Mar 20, 2026 3mo ago
Last Modified Mar 23, 2026 3mo ago

Description

Free5GC is an open-source Linux Foundation project for 5th generation (5G) mobile core networks. Versions prior to 1.4.2 are vulnerable to procedure panic caused by Nil Pointer Dereference in the /sdm-subscriptions endpoint. A remote attacker can cause the UDM service to panic and crash by sending a crafted POST request to the /sdm-subscriptions endpoint with a malformed URL path containing path traversal sequences (../) and a large JSON payload. The DataChangeNotificationProcedure function in notifier.go attempts to access a nil pointer without proper validation, causing a complete service crash with "runtime error: invalid memory address or nil pointer dereference". Exploitation would result in UDM functionality disruption until recovery by restart. This issue has been fixed 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
38.2% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 2

CWE-476 NULL Pointer Dereference Memory Safety
CWE-478

Affected Products 1

VendorProductVersionRange
free5gcudm* <1.4.2

References 4

  • github.com https://github.com/free5gc/free5gc/issues/781
    ExploitIssue TrackingPatchVendor Advisory
  • github.com https://github.com/free5gc/free5gc/security/advisories/GHSA-7g27-v5wj-jr75
    PatchVendor Advisory
  • github.com https://github.com/free5gc/udm/commit/65d7070f4bfd016864cbbaefbd506bbc85d2fa92
    Patch
  • github.com https://github.com/free5gc/udm/pull/78
    Issue TrackingPatch

Remediation

  • github.com https://github.com/free5gc/free5gc/issues/781
    ExploitIssue TrackingPatchVendor Advisory
  • github.com https://github.com/free5gc/free5gc/security/advisories/GHSA-7g27-v5wj-jr75
    PatchVendor Advisory
  • github.com https://github.com/free5gc/udm/commit/65d7070f4bfd016864cbbaefbd506bbc85d2fa92
    Patch
  • github.com https://github.com/free5gc/udm/pull/78
    Issue TrackingPatch