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Ella Core: Handover failures during concurrent Security Mode Command

Type: advisorySources: OSV

Ella Core is a 5G core designed for private networks. Prior to 1.10.0, Ella Core didn't enforce security rules on concurrent running of security procedures defined in TS 33.501 §6.9.5.1 — it could send a NAS Security Mode Command while an N2 handover was still pending (and vice versa). Concurrent Security Mode Command and N2 handover produce a KgNB mismatch between the UE and target gNB, causing the handover to fail. Requires a stalled gNB + re-registration race to trigger. This vulnerability is fixed in 1.10.0.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-44474
Confirmed fixed CVEs
Not specified
Updated in this feed
2 Nov 2026, 17:19 UTC · Revision 1

Source evidence

Ella Core: Handover failures during concurrent Security Mode Command

core-osv · Original source

Published 27 May 2026, 15:14 UTC

Ella Core is a 5G core designed for private networks. Prior to 1.10.0, Ella Core didn't enforce security rules on concurrent running of security procedures defined in TS 33.501 §6.9.5.1 — it could send a NAS Security Mode Command while an N2 handover was still pending (and vice versa). Concurrent Security Mode Command and N2 handover produce a KgNB mismatch between the UE and target gNB, causing the handover to fail. Requires a stalled gNB + re-registration race to trigger. This vulnerability is fixed in 1.10.0.

osv:CVE-2026-44474
Complete source record
{
  "id": "78e725adc77eeec3cd30470539f44b4b524e08de26a766062a62f56d3d98f215",
  "url": "https://osv.dev/vulnerability/CVE-2026-44474",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Ella Core: Handover failures during concurrent Security Mode Command",
    "summary": "Ella Core is a 5G core designed for private networks. Prior to 1.10.0, Ella Core didn't enforce security rules on concurrent running of security procedures defined in TS 33.501 §6.9.5.1 — it could send a NAS Security Mode Command while an N2 handover was still pending (and vice versa). Concurrent Security Mode Command and N2 handover produce a KgNB mismatch between the UE and target gNB, causing the handover to fail. Requires a stalled gNB + re-registration race to trigger. This vulnerability is fixed in 1.10.0.",
    "evidence": "osv:CVE-2026-44474",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2026-44474",
      "aliases": [
        "CVE-2026-44474",
        "GHSA-mc29-hmx6-856q",
        "GO-2026-5502"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/ellanetworks/core",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "625555b0abcd5d2f788d35160d099a92f1e8aa67"
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              "database_specific": {
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                  {
                    "range": [
                      {
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                      },
                      {
                        "fixed": "1.10.0"
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                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.9.1",
            "v1.9.0",
            "v1.8.1",
            "v1.8.0",
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            "v0.0.7",
            "v0.0.6",
            "v0.0.5",
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44474.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:21.412832070Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44474.json",
        "https://github.com/ellanetworks/core/security/advisories/GHSA-mc29-hmx6-856q",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-44474"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-358"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44474.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-44474",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 487686,
  "published_at": "2026-05-27T15:14:49.39+00:00"
}