Vulnerability-Lookup

CNVD-2026-37850

Vulnerability from cnvd - Published: 2026-09-15

Title

free5GC空指针取消引用漏洞（CNVD-2026-37850）

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PCF的npcf-policyauthorization POST /app-sessions处理程序在处理特定请求时未能正确验证routeReq是否为空即直接解引用，攻击者可利用该漏洞通过发送带有特定参数的认证请求导致服务拒绝。

Severity

中

Patch Name

free5GC空指针取消引用漏洞（CNVD-2026-37850）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-wwqh-7jm5-gj7w

Impacted products

Name
free5GC free5GC <4.2.2

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-44317",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-44317"
    }
  },
  "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\u4e8ePCF\u7684npcf-policyauthorization POST /app-sessions\u5904\u7406\u7a0b\u5e8f\u5728\u5904\u7406\u7279\u5b9a\u8bf7\u6c42\u65f6\u672a\u80fd\u6b63\u786e\u9a8c\u8bc1routeReq\u662f\u5426\u4e3a\u7a7a\u5373\u76f4\u63a5\u89e3\u5f15\u7528\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u53d1\u9001\u5e26\u6709\u7279\u5b9a\u53c2\u6570\u7684\u8ba4\u8bc1\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-2026-37850",
  "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\u4e8ePCF\u7684npcf-policyauthorization POST /app-sessions\u5904\u7406\u7a0b\u5e8f\u5728\u5904\u7406\u7279\u5b9a\u8bf7\u6c42\u65f6\u672a\u80fd\u6b63\u786e\u9a8c\u8bc1routeReq\u662f\u5426\u4e3a\u7a7a\u5373\u76f4\u63a5\u89e3\u5f15\u7528\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u53d1\u9001\u5e26\u6709\u7279\u5b9a\u53c2\u6570\u7684\u8ba4\u8bc1\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\uff08CNVD-2026-37850\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "free5GC free5GC \u003c4.2.2"
  },
  "referenceLink": "https://github.com/free5gc/free5gc/security/advisories/GHSA-wwqh-7jm5-gj7w",
  "serverity": "\u4e2d",
  "submitTime": "2026-05-28",
  "title": "free5GC\u7a7a\u6307\u9488\u53d6\u6d88\u5f15\u7528\u6f0f\u6d1e\uff08CNVD-2026-37850\uff09"
}

CVE-2026-44317 (GCVE-0-2026-44317)

Vulnerability from cvelistv5 – Published: 2026-05-27 15:50 – Updated: 2026-05-28 14:46

Title

free5GC: PCF npcf-policyauthorization POST /app-sessions panics on suppFeat=1 with missing AfRoutReq via nil pointer dereference

Summary

free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's PCF POST /npcf-policyauthorization/v1/app-sessions handler panics on a single authenticated request whose ascReqData.suppFeat == "1" (enabling traffic-routing feature negotiation) and whose medComponents entries supply an afAppId but NO AfRoutReq. The create path then calls provisioningOfTrafficRoutingInfo(smPolicy, appID, routeReq, ...) with routeReq == nil and dereferences routeReq.RouteToLocs (and other fields) without a nil check, causing runtime error: invalid memory address or nil pointer dereference. Gin recovery converts the panic into HTTP 500. This vulnerability is fixed in 4.2.2.

Severity

6.5 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-28 14:45 UTC

CWE

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

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/free5gc/free5gc/security/advis…	x_refsource_CONFIRM
https://github.com/free5gc/free5gc/issues/879	x_refsource_MISC
https://github.com/free5gc/pcf/pull/65	x_refsource_MISC
https://github.com/free5gc/pcf/commit/508d70b8527…	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-2026-44317",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-28T14:45:45.407067Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-28T14:46:12.592Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/free5gc/free5gc/security/advisories/GHSA-wwqh-7jm5-gj7w"
          }
        ],
        "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 PCF POST /npcf-policyauthorization/v1/app-sessions handler panics on a single authenticated request whose ascReqData.suppFeat == \"1\" (enabling traffic-routing feature negotiation) and whose medComponents entries supply an afAppId but NO AfRoutReq. The create path then calls provisioningOfTrafficRoutingInfo(smPolicy, appID, routeReq, ...) with routeReq == nil and dereferences routeReq.RouteToLocs (and other fields) without a nil check, causing runtime error: invalid memory address or nil pointer dereference. Gin recovery converts the panic into HTTP 500. This vulnerability is fixed in 4.2.2."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "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"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T15:50:18.242Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/free5gc/free5gc/security/advisories/GHSA-wwqh-7jm5-gj7w",
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        },
        {
          "name": "https://github.com/free5gc/free5gc/issues/879",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/free5gc/free5gc/issues/879"
        },
        {
          "name": "https://github.com/free5gc/pcf/pull/65",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/free5gc/pcf/pull/65"
        },
        {
          "name": "https://github.com/free5gc/pcf/commit/508d70b8527a6c8c923179dad450ea01e16b6aeb",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/free5gc/pcf/commit/508d70b8527a6c8c923179dad450ea01e16b6aeb"
        }
      ],
      "source": {
        "advisory": "GHSA-wwqh-7jm5-gj7w",
        "discovery": "UNKNOWN"
      },
      "title": "free5GC: PCF npcf-policyauthorization POST /app-sessions panics on suppFeat=1 with missing AfRoutReq via nil pointer dereference"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-44317",
    "datePublished": "2026-05-27T15:50:18.242Z",
    "dateReserved": "2026-05-05T19:00:06.022Z",
    "dateUpdated": "2026-05-28T14:46:12.592Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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CNVD-2026-37850

CVE-2026-44317 (GCVE-0-2026-44317)

Tags

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Nomenclature

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