FKIE_CVE-2026-44328

Vulnerability from fkie_nvd - Published: 2026-05-27 17:16 - Updated: 2026-05-28 16:24
Severity
8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Summary
free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's SMF mounts the UPI management route group without inbound OAuth2 middleware. On top of that, the DELETE /upi/v1/upNodesLinks/{upNodeRef} handler unconditionally dereferences upNode.UPF after the type-guarded async release, even though AN-typed nodes are constructed without a UPF object. As a result, a single unauthenticated DELETE /upi/v1/upNodesLinks/gNB1 request crashes the handler with a nil-pointer panic AND mutates the in-memory user-plane topology before panicking (the UpNodeDelete(upNodeRef) line runs first). This is an unauthenticated, state-mutating panic-DoS sink that an off-path network attacker can trigger by name against any AN entry. This vulnerability is fixed in 4.2.2.
References
security-advisories@github.comhttps://github.com/free5gc/free5gc/issues/905Exploit, Issue Tracking
security-advisories@github.comhttps://github.com/free5gc/free5gc/security/advisories/GHSA-p9mg-74mg-cwwrExploit, Vendor Advisory
security-advisories@github.comhttps://github.com/free5gc/smf/commit/b57bc48081c3d3a2f333d02eb78e4fd31a120debPatch
security-advisories@github.comhttps://github.com/free5gc/smf/pull/199Issue Tracking, Patch
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/free5gc/free5gc/issues/905Exploit, Issue Tracking
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/free5gc/free5gc/security/advisories/GHSA-p9mg-74mg-cwwrExploit, Vendor Advisory
Impacted products
Vendor Product Version
free5gc free5gc *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "EF7EBB95-EB4E-44C5-BF0A-9C99B0A7775F",
              "versionEndExcluding": "4.2.2",
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          "operator": "OR"
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC\u0027s SMF mounts the UPI management route group without inbound OAuth2 middleware. On top of that, the DELETE /upi/v1/upNodesLinks/{upNodeRef} handler unconditionally dereferences upNode.UPF after the type-guarded async release, even though AN-typed nodes are constructed without a UPF object. As a result, a single unauthenticated DELETE /upi/v1/upNodesLinks/gNB1 request crashes the handler with a nil-pointer panic AND mutates the in-memory user-plane topology before panicking (the UpNodeDelete(upNodeRef) line runs first). This is an unauthenticated, state-mutating panic-DoS sink that an off-path network attacker can trigger by name against any AN entry. This vulnerability is fixed in 4.2.2."
    }
  ],
  "id": "CVE-2026-44328",
  "lastModified": "2026-05-28T16:24:05.127",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.2,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
          "version": "3.1"
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        "impactScore": 4.2,
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        "type": "Secondary"
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  "published": "2026-05-27T17:16:38.347",
  "references": [
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      "tags": [
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  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-306"
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        {
          "lang": "en",
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      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}


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