SCA: security update for github.com/free5gc/ausf, github.com/free5gc/free5gc (GHSA-qj55-47fp-p62j)

medium Tenable Self-Hosted Container Security Plugin ID 445524

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

- free5GC is an open-source implementation of the 5G core network. Prior to 1.4.5, the free5GC AUSF
(Authentication Server Function) does not validate the supiOrSuci field in UE authentication requests.
Null bytes (\x00) and other control characters pass through JSON parsing unchanged and are forwarded to
the UDM in an unescaped URL path. This causes Go's net/url.Parse() to fail, returning HTTP 500 "System
failure" and leaking internal stack traces. An unauthenticated attacker can trigger this at scale causing
denial of service for all subscribers attempting authentication through the affected AUSF. This
vulnerability is fixed in 1.4.5. (CVE-2026-53551)

Solution

Update the github.com/free5gc/ausf library and its related packages to version 1.4.5 or later.

Plugin Details

Severity: Medium

ID: 445524

Version: Revision 1.1

Type: Local

Family: SCA Checks

Published: 8/1/2026

Updated: 8/1/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.74

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2026-53551

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 6.9

Threat Score: 2.7

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 7/31/2026

Vulnerability Publication Date: 7/31/2026

Reference Information

CVE: CVE-2026-53551

cwe: CWE-20

Detections

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