CVE-2026-44321

Published: Mag 27, 2026 Last Modified: Mag 27, 2026

ExploitDB:

Other exploit source:

Google Dorks:

HIGH 7,5

Source: [email protected]

Attack Vector: network

Attack Complexity: low

Privileges Required: none

User Interaction: none

Scope: unchanged

Confidentiality: none

Integrity: none

Availability: high

Description

AI Translation Available

free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's SMF mounts the UPI management route group without inbound OAuth2 middleware. The POST /upi/v1/upNodesLinks create-or-update handler accepts attacker-controlled JSON and passes it directly into UpNodesFromConfiguration(), which calls logger.InitLog.Fatalf(...) on several validation failures. One confirmed path is the UE-IP-pool overlap check: a single unauthenticated POST that adds a new UPF whose pool overlaps an existing UPF terminates the entire SMF process (docker ps shows Exited (1)), not just the goroutine. This vulnerability is fixed in 4.2.2.

306

Missing Authentication for Critical Function

Draft

Abstraction: Base Structure: Simple

Common Consequences

Security Scopes Affected:

Access Control Other

Potential Impacts:

Gain Privileges Or Assume Identity Varies By Context

Applicable Platforms

Technologies: Cloud Computing, ICS/OT

Likelihood of Exploit: High

View CWE Details

617

Reachable Assertion

Draft

Abstraction: Base Structure: Simple

Common Consequences

Security Scopes Affected:

Availability

Potential Impacts:

Dos: Crash, Exit, Or Restart

Applicable Platforms

Languages: Not Language-Specific, C, Java, Rust

View CWE Details

862

Missing Authorization

Incomplete

Abstraction: Class Structure: Simple

Common Consequences

Security Scopes Affected:

Confidentiality Integrity Access Control Availability

Potential Impacts:

Read Application Data Read Files Or Directories Modify Application Data Modify Files Or Directories Gain Privileges Or Assume Identity Bypass Protection Mechanism Dos: Crash, Exit, Or Restart Dos: Resource Consumption (Cpu) Dos: Resource Consumption (Memory) Dos: Resource Consumption (Other)