CVE-2026-33063: Github.com/free5gc/ausf Free5GC AUSF UE Authentication Panic Vulnerability
HIGHCVE-2026-33063 is a HIGH free5gc ausf ue authentication panic vulnerability (CWE-476: NULL Pointer Dereference) affecting Github.com/free5gc/ausf libraries in the Go ecosystem. The issue involves free5gc ausf ue authentication panic on nil sucisupimap interface conversion. Remediation is available by upgrading affected packages to version 1.4.2.
CVE-2026-33063 at a Glance
How to Fix CVE-2026-33063
To remediate this vulnerability, upgrade all affected Github.com/free5gc/ausf dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade github.com/free5gc/ausf to 1.4.2Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for github.com/free5gc/ausfHow to Check if You Are Affected
To determine whether your application is affected by CVE-2026-33063, inspect your project dependencies for Github.com/free5gc/ausf:
inspect dependencies for github.com/free5gc/ausfAnalyze the terminal output to locate any version of Github.com/free5gc/ausf in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.4.2), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-476: NULL Pointer Dereference, where the product dereferences a pointer that it expects to be valid but is null. In Github.com/free5gc/ausf, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-33063 Affected Github.com/free5gc/ausf Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
github.com/free5gc/ausf
|
Go |
< 1.4.2
|
1.4.2
|
References
Frequently Asked Questions
What is CVE-2026-33063?
Which Github.com/free5gc/ausf versions are affected?
What version fixes CVE-2026-33063?
Is github.com/free5gc/ausf affected?
What CWE is associated with CVE-2026-33063?
How can I check Go dependencies for CVE-2026-33063?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-4jrw-92fg-4jwx",
"modified" : "2026-03-20T21:20:57Z",
"published" : "2026-03-18T20:06:14Z",
"aliases" : [ "CVE-2026-33063" ],
"summary" : "free5GC AUSF UE Authentication Panic on Nil SuciSupiMap Interface Conversion",
"details" : "**Impact** \nThis is an Improper Null Check vulnerability leading to Denial of Service. \n- **Security Impact**: A remote attacker can cause the AUSF service to panic and crash by sending a crafted UE authentication request that triggers a nil interface conversion in the `GetSupiFromSuciSupiMap` function. This results in complete denial of service for the AUSF authentication service. \n- **Functional Impact**: The `GetSupiFromSuciSupiMap` function attempts to perform an interface conversion from `interface{}` to `*context.SuciSupiMap` without checking if the underlying value is nil. When `SuciSupiMap` is nil, the code panics with \"interface conversion: interface {} is nil, not *context.SuciSupiMap\". \n- **Affected Parties**: All deployments of free5GC v4.0.1 using the AUSF UE authentication service (`/nausf-auth/v1/ue-authentications` endpoint).\n\n**Patches** \nYes, the issue has been patched. \nThe fix is implemented in PR free5gc/ausf#52 (commit: [add specific commit hash if available]). \nUsers should upgrade to the next release of free5GC that includes this commit.\n\n**Workarounds** \nThere is no direct workaround at the application level. The recommendation is to apply the provided patch or restrict access to the AUSF API to trusted sources only.",
"severity" : [ {
"type" : "CVSS_V4",
"score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/free5gc/ausf"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "1.4.2"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/free5gc/free5gc/security/advisories/GHSA-4jrw-92fg-4jwx"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-33063"
}, {
"type" : "WEB",
"url" : "https://github.com/free5gc/free5gc/issues/778"
}, {
"type" : "WEB",
"url" : "https://github.com/free5gc/ausf/pull/52"
}, {
"type" : "WEB",
"url" : "https://github.com/free5gc/ausf/commit/3b9ac4403c2756dc89a5ed3cdcefe688458588aa"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/free5gc/free5gc"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-476" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2026-03-18T20:06:14Z",
"nvd_published_at" : "2026-03-20T03:16:01Z"
}
}