PT-2026-26186 · Linux Foundation · Free5Gc

Zfei10990-Cmd · Published 2026-03-18 · Updated 2026-03-27 · CVE-2026-33064

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions Free5GC versions prior to 1.4.2

Description Free5GC is an open-source Linux Foundation project for 5th generation (5G) mobile core networks. Versions prior to 1.4.2 are susceptible to a procedure panic caused by a Nil Pointer Dereference in the /sdm-subscriptions API 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, resulting in a complete service crash. Exploitation leads to disruption of UDM functionality until recovery via restart.

Recommendations Upgrade to Free5GC version 1.4.2 or later.

Exploit

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

CWE-478

Related Identifiers

CVE-2026-33064

GHSA-7G27-V5WJ-JR75

GO-2026-4757

SUSE-SU-2026:1135-1

Affected Products

Free5Gc

References · 155

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33064.json · Exploit
• https://github.com/free5gc/free5gc/security/advisories/GHSA-7g27-v5wj-jr75 · Vendor Advisory
• https://github.com/free5gc/free5gc/issues/781 · Vendor Advisory
• https://github.com/free5gc/udm/commit/65d7070f4bfd016864cbbaefbd506bbc85d2fa92 · Patch
• https://github.com/free5gc/udm/pull/78 · Patch
• https://osv.dev/vulnerability/GO-2026-4757 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-33064 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-33064 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-33064 · Security Note
• https://osv.dev/vulnerability/CVE-2026-33064 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:1135-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33064 · Security Note
• https://osv.dev/vulnerability/GHSA-7g27-v5wj-jr75 · Vendor Advisory
• https://github.com/free5gc/udm · Note
• https://suse.com/security/cve/CVE-2026-33419 · Note