Back to overview

CVE-2026-44327

CRITICAL Exploitation: PoC
10.0
CVSS 3.1
Description
free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NEF mounts the nnef-oam route group without inbound OAuth2/bearer-token authorization. A network attacker who can reach NEF on the SBI can hit the OAM route with no Authorization header at all and the handler returns 200 OK. The current OAM handler is a stub that returns null, but the structural defect is route-group-scoped: the entire OAM route group has no inbound auth middleware, so every future OAM operation added to this group inherits the missing auth boundary by default. This vulnerability is fixed in 4.2.2.

Metadata

CVE ID
CVE-2026-44327
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-05-05 19:00 UTC
Published
2026-05-27 15:40 UTC
Last updated
2026-05-28 14:40 UTC
Primary CWE
CWE-306
CWE-306: Missing Authentication for Critical Function
Vendor / Product
free5gc / free5gc
Sources
cve.org  ·  NVD

Severity & Metrics

10.0 CRITICAL CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H
SSVC — CISA Coordinator
Exploitation
PoC
Automatable
yes
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
free5gc free5gc — < 4.2.2
Weakness (CWE)
CWESourceDescription
CWE-306 cna CWE-306: Missing Authentication for Critical Function
CWE-862 cna CWE-862: Missing Authorization
CVSS scores (1)
ScoreSeverityVersionSourceVector
10.0 CRITICAL 3.1 cna CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H
References (3)
Back to overview