Ella Core Vulnerable to UE Downlink Redirection via Forged PDUSessionResourceSetupResponse

高 7.1CVE-2026-44473 · GHSA-qfxw-v8qx-vj3v · GO-2026-5581 · 27/05/2026 公開 · 26/10/2026 更新

要点

CVE-2026-44473 は github.com/ellanetworks/core に影響する深刻度「高」 (CVSS 7.1) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.17%（全脆弱性の 5.8% より高い）。
対処：1.10.0 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
github.com/ellanetworks/core Go	`< 1.10.0`	`1.10.0`

概要

Summary

A radio with a valid NG Setup can send a forged PDUSessionResourceSetupResponse carrying any UE's AMF-UE-NGAP-ID. Ella Core does not verify the message arrived on the SCTP association bound to that UE's logical NG-connection, then creates a GTP tunnel towards that radio.

Impact

Downlink user-plane traffic for the targeted UE is redirected to the attacker's radio.

Fix

UE context lookups are now scoped to the sending radio's SCTP association.

NVD の説明

Ella Core is a 5G core designed for private networks. Prior to 1.10.0, a radio with a valid NG Setup can send a forged PDUSessionResourceSetupResponse carrying any UE's AMF-UE-NGAP-ID. Ella Core does not verify the message arrived on the SCTP association bound to that UE's logical NG-connection, then creates a GTP tunnel towards that radio. This vulnerability is fixed in 1.10.0.