free5GC AUSF authentication contexts can be overwritten by concurrent requests for the same SUPI — GHSA-334Q-H5G3-FPXV

Summary

### Summary The AUSF component of free5GC stores per-subscriber authentication state in a global `sync.Map` keyed only by SUPI. Every incoming authentication request creates a new `AusfUeContext` and stores it under that SUPI key without checking whether an authentication procedure is already in progress and without generating a per-session unique identifier. An attacker with access to the AUSF SBI/N12 interface…

Timeline

Published by source

2026-08-28

Risk context

• Reported severity or threat level: high.
• Reported CVSS score: 7.5 out of 10.
• Review exposure for the affected product or family: go: github.com/free5gc/ausf.

Product

go: github.com/free5gc/ausf

What to do

General, cautious steps (verify details in the official source):

• Prioritize patching or mitigation immediately (treat as actively risky).
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

Evidence and provenance

Canonical advisory ID

GHSA-334Q-H5G3-FPXV

Source

GitHub

Vendor

GitHub

Published by source

2026-08-28

Last source activity

2026-08-28

Additional identifiers

CVE-2026-55784

Curated by

hlukh.ch

Related advisories and connections

These advisories are connected by shared CVE, product, vendor, source, or time signals.