CVE-2026-55784: free5gc <= 1.4.4

CVE-2026-55784. CVSS 3.1 base score 7.5 (HIGH, Vendor/CNA). EPSS 0.00419 (percentile 0.34784), scored 19-Oct-2026.

Affected technology

free5gc · <= 1.4.4
free5gc

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 3.1): Network (remote) · No privileges required · No user interaction required

What an attacker can do

An attacker with access to the AUSF SBI/N12 interface can send concurrent POST /nausf-auth/v1/ue-authentications requests for the same target SUPI, causing all attempts to share one logical authentication context URL while K_aut, XRES, and EapID are repeatedly overwritten. Vendor/CNA’s CVSS 3.1 assessment (base score 7.5/10) rates confidentiality and integrity impact as none; availability impact as high.

Published 20-Oct-2026 16:40 UTC

CWE: CWE-362
CCR priority: 30.1 /100 (P4)
CVSS 3.1: 7.5 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H · Vendor/CNA
EPSS: 0.00419 · percentile 0.34784 · 2026-10-19
KEV: no

Provenance

NVD CVE API 2.0 · Source record · observed 2026-10-20 16:40:23.998050+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2026-55784.html