Vulnerability-Lookup

CNVD-2026-37849

Vulnerability from cnvd - Published: 2026-09-15

Title

free5GC空指针取消引用漏洞

Description

free5GC是一个‌开源的5G核心网项目‌，由Linux基金会托管，主要用来实现3GPP标准里定义的5G核心网络功能。 free5GC存在空指针取消引用漏洞，该漏洞源于NEF PATCH请求处理中，当上游UDR调用失败且消费者包装器返回err != nil并伴随nil的*ProblemDetails时，errPfdData != nil分支正确构建了problemDetailsErr但随后读取了nil的problemDetails.Cause，导致崩溃。攻击者可利用该漏洞通过发送特定PATCH请求导致服务拒绝。

Severity

高

Patch Name

free5GC空指针取消引用漏洞的补丁

Patch Description

Formal description

目前厂商已发布升级程序修复该安全问题，详情见厂商官网: https://free5gc.org/

Reference

https://github.com/free5gc/free5gc/security/advisories/GHSA-j59f-x285-69jx

Impacted products

Name
free5GC free5GC <4.2.2

Show details on source website

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-44322",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-44322"
    }
  },
  "description": "free5GC\u662f\u4e00\u4e2a\u200c\u5f00\u6e90\u76845G\u6838\u5fc3\u7f51\u9879\u76ee\u200c\uff0c\u7531Linux\u57fa\u91d1\u4f1a\u6258\u7ba1\uff0c\u4e3b\u8981\u7528\u6765\u5b9e\u73b03GPP\u6807\u51c6\u91cc\u5b9a\u4e49\u76845G\u6838\u5fc3\u7f51\u7edc\u529f\u80fd\u3002\n\nfree5GC\u5b58\u5728\u7a7a\u6307\u9488\u53d6\u6d88\u5f15\u7528\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8eNEF PATCH\u8bf7\u6c42\u5904\u7406\u4e2d\uff0c\u5f53\u4e0a\u6e38UDR\u8c03\u7528\u5931\u8d25\u4e14\u6d88\u8d39\u8005\u5305\u88c5\u5668\u8fd4\u56deerr != nil\u5e76\u4f34\u968fnil\u7684*ProblemDetails\u65f6\uff0cerrPfdData != nil\u5206\u652f\u6b63\u786e\u6784\u5efa\u4e86problemDetailsErr\u4f46\u968f\u540e\u8bfb\u53d6\u4e86nil\u7684problemDetails.Cause\uff0c\u5bfc\u81f4\u5d29\u6e83\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u53d1\u9001\u7279\u5b9aPATCH\u8bf7\u6c42\u5bfc\u81f4\u670d\u52a1\u62d2\u7edd\u3002",
  "formalWay": "\u76ee\u524d\u5382\u5546\u5df2\u53d1\u5e03\u5347\u7ea7\u7a0b\u5e8f\u4fee\u590d\u8be5\u5b89\u5168\u95ee\u9898\uff0c\u8be6\u60c5\u89c1\u5382\u5546\u5b98\u7f51:\r\nhttps://free5gc.org/",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-37849",
  "openTime": "2026-09-15",
  "patchDescription": "free5GC\u662f\u4e00\u4e2a\u200c\u5f00\u6e90\u76845G\u6838\u5fc3\u7f51\u9879\u76ee\u200c\uff0c\u7531Linux\u57fa\u91d1\u4f1a\u6258\u7ba1\uff0c\u4e3b\u8981\u7528\u6765\u5b9e\u73b03GPP\u6807\u51c6\u91cc\u5b9a\u4e49\u76845G\u6838\u5fc3\u7f51\u7edc\u529f\u80fd\u3002\r\n\r\nfree5GC\u5b58\u5728\u7a7a\u6307\u9488\u53d6\u6d88\u5f15\u7528\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8eNEF PATCH\u8bf7\u6c42\u5904\u7406\u4e2d\uff0c\u5f53\u4e0a\u6e38UDR\u8c03\u7528\u5931\u8d25\u4e14\u6d88\u8d39\u8005\u5305\u88c5\u5668\u8fd4\u56deerr != nil\u5e76\u4f34\u968fnil\u7684*ProblemDetails\u65f6\uff0cerrPfdData != nil\u5206\u652f\u6b63\u786e\u6784\u5efa\u4e86problemDetailsErr\u4f46\u968f\u540e\u8bfb\u53d6\u4e86nil\u7684problemDetails.Cause\uff0c\u5bfc\u81f4\u5d29\u6e83\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u53d1\u9001\u7279\u5b9aPATCH\u8bf7\u6c42\u5bfc\u81f4\u670d\u52a1\u62d2\u7edd\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "free5GC\u7a7a\u6307\u9488\u53d6\u6d88\u5f15\u7528\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "free5GC free5GC \u003c4.2.2"
  },
  "referenceLink": "https://github.com/free5gc/free5gc/security/advisories/GHSA-j59f-x285-69jx",
  "serverity": "\u9ad8",
  "submitTime": "2026-05-28",
  "title": "free5GC\u7a7a\u6307\u9488\u53d6\u6d88\u5f15\u7528\u6f0f\u6d1e"
}

CVE-2026-44322 (GCVE-0-2026-44322)

Vulnerability from cvelistv5 – Published: 2026-05-27 15:46 – Updated: 2026-05-28 14:42

Title

free5GC: NEF 3gpp-pfd-management PATCH applications/{appId} panics on UDR access failure due to nil ProblemDetails dereference

Summary

free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NEF PATCH /3gpp-pfd-management/v1/{afId}/transactions/{transId}/applications/{appId} handler panics with a nil-pointer dereference when the upstream UDR call fails AND the consumer wrapper returns err != nil together with a nil *ProblemDetails. The handler's errPfdData != nil branch builds its own problemDetailsErr correctly, but immediately after it reads problemDetails.Cause (the OTHER value, which is nil in this branch) and panics. Gin recovery converts the panic into HTTP 500, so a single PATCH against this endpoint returns 500 instead of the intended controlled error response whenever UDR access is failing. This vulnerability is fixed in 4.2.2.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-28 14:41 UTC

CWE

CWE-476 - NULL Pointer Dereference
CWE-754 - Improper Check for Unusual or Exceptional Conditions

Assigner

GitHub_M mitre root Scorecard

References

4 references

URL	Tags
https://github.com/free5gc/free5gc/security/advis…	x_refsource_CONFIRM
https://github.com/free5gc/free5gc/issues/925	x_refsource_MISC
https://github.com/free5gc/nef/pull/22	x_refsource_MISC
https://github.com/free5gc/nef/commit/72a47f3fab4…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
free5gc	free5gc	Affected: < 4.2.2

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-44322",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-28T14:41:42.971095Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-28T14:42:42.998Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/free5gc/free5gc/security/advisories/GHSA-j59f-x285-69jx"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "free5gc",
          "vendor": "free5gc",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.2.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC\u0027s NEF PATCH /3gpp-pfd-management/v1/{afId}/transactions/{transId}/applications/{appId} handler panics with a nil-pointer dereference when the upstream UDR call fails AND the consumer wrapper returns err != nil together with a nil *ProblemDetails. The handler\u0027s errPfdData != nil branch builds its own problemDetailsErr correctly, but immediately after it reads problemDetails.Cause (the OTHER value, which is nil in this branch) and panics. Gin recovery converts the panic into HTTP 500, so a single PATCH against this endpoint returns 500 instead of the intended controlled error response whenever UDR access is failing. This vulnerability is fixed in 4.2.2."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
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          "descriptions": [
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              "description": "CWE-476: NULL Pointer Dereference",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-754",
              "description": "CWE-754: Improper Check for Unusual or Exceptional Conditions",
              "lang": "en",
              "type": "CWE"
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T15:46:10.475Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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      },
      "references": [
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          "name": "https://github.com/free5gc/free5gc/security/advisories/GHSA-j59f-x285-69jx",
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        },
        {
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          "tags": [
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          ],
          "url": "https://github.com/free5gc/free5gc/issues/925"
        },
        {
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          "tags": [
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          "url": "https://github.com/free5gc/nef/pull/22"
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          "tags": [
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          "url": "https://github.com/free5gc/nef/commit/72a47f3fab4dffbd227f8d92c5f69dca93b610cb"
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        "discovery": "UNKNOWN"
      },
      "title": "free5GC: NEF 3gpp-pfd-management PATCH applications/{appId} panics on UDR access failure due to nil ProblemDetails dereference"
    }
  },
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    "dateReserved": "2026-05-05T19:00:06.022Z",
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    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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CNVD-2026-37849

CVE-2026-44322 (GCVE-0-2026-44322)

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