Vulnerability-Lookup

CNVD-2026-37845

Vulnerability from cnvd - Published: 2026-09-14

Title

free5GC输入验证错误漏洞

Description

free5GC是一个‌开源5G核心网项目‌，由Linux基金会托管，目标是实现3GPPRelease15及后续版本定义的5G核心网络功能。 free5GC存在输入验证错误漏洞，该漏洞源于未能正确验证UE认证请求中的supiOrSuci字段，空字节和控制字符经JSON解析后以未转义URL路径转发至UDM，导致Go的net/url.Parse()失败并返回HTTP 500错误，攻击者可利用该漏洞大规模触发拒绝服务，使所有通过受影响AUSF认证的订阅者受影响。

Severity

中

Patch Name

free5GC输入验证错误漏洞的补丁

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://github.com/free5gc/free5gc/releases

Reference

https://github.com/free5gc/free5gc/security/advisories/GHSA-qj55-47fp-p62j

Impacted products

Name
free5GC free5GC <1.4.5

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-53551",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-53551"
    }
  },
  "description": "free5GC\u662f\u4e00\u4e2a\u200c\u5f00\u6e905G\u6838\u5fc3\u7f51\u9879\u76ee\u200c\uff0c\u7531Linux\u57fa\u91d1\u4f1a\u6258\u7ba1\uff0c\u76ee\u6807\u662f\u5b9e\u73b03GPPRelease15\u53ca\u540e\u7eed\u7248\u672c\u5b9a\u4e49\u76845G\u6838\u5fc3\u7f51\u7edc\u529f\u80fd\u3002\n\nfree5GC\u5b58\u5728\u8f93\u5165\u9a8c\u8bc1\u9519\u8bef\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u672a\u80fd\u6b63\u786e\u9a8c\u8bc1UE\u8ba4\u8bc1\u8bf7\u6c42\u4e2d\u7684supiOrSuci\u5b57\u6bb5\uff0c\u7a7a\u5b57\u8282\u548c\u63a7\u5236\u5b57\u7b26\u7ecfJSON\u89e3\u6790\u540e\u4ee5\u672a\u8f6c\u4e49URL\u8def\u5f84\u8f6c\u53d1\u81f3UDM\uff0c\u5bfc\u81f4Go\u7684net/url.Parse()\u5931\u8d25\u5e76\u8fd4\u56deHTTP 500\u9519\u8bef\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5927\u89c4\u6a21\u89e6\u53d1\u62d2\u7edd\u670d\u52a1\uff0c\u4f7f\u6240\u6709\u901a\u8fc7\u53d7\u5f71\u54cdAUSF\u8ba4\u8bc1\u7684\u8ba2\u9605\u8005\u53d7\u5f71\u54cd\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://github.com/free5gc/free5gc/releases",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-37845",
  "openTime": "2026-09-14",
  "patchDescription": "free5GC\u662f\u4e00\u4e2a\u200c\u5f00\u6e905G\u6838\u5fc3\u7f51\u9879\u76ee\u200c\uff0c\u7531Linux\u57fa\u91d1\u4f1a\u6258\u7ba1\uff0c\u76ee\u6807\u662f\u5b9e\u73b03GPPRelease15\u53ca\u540e\u7eed\u7248\u672c\u5b9a\u4e49\u76845G\u6838\u5fc3\u7f51\u7edc\u529f\u80fd\u3002\r\n\r\nfree5GC\u5b58\u5728\u8f93\u5165\u9a8c\u8bc1\u9519\u8bef\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u672a\u80fd\u6b63\u786e\u9a8c\u8bc1UE\u8ba4\u8bc1\u8bf7\u6c42\u4e2d\u7684supiOrSuci\u5b57\u6bb5\uff0c\u7a7a\u5b57\u8282\u548c\u63a7\u5236\u5b57\u7b26\u7ecfJSON\u89e3\u6790\u540e\u4ee5\u672a\u8f6c\u4e49URL\u8def\u5f84\u8f6c\u53d1\u81f3UDM\uff0c\u5bfc\u81f4Go\u7684net/url.Parse()\u5931\u8d25\u5e76\u8fd4\u56deHTTP 500\u9519\u8bef\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5927\u89c4\u6a21\u89e6\u53d1\u62d2\u7edd\u670d\u52a1\uff0c\u4f7f\u6240\u6709\u901a\u8fc7\u53d7\u5f71\u54cdAUSF\u8ba4\u8bc1\u7684\u8ba2\u9605\u8005\u53d7\u5f71\u54cd\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\u8f93\u5165\u9a8c\u8bc1\u9519\u8bef\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "free5GC free5GC \u003c1.4.5"
  },
  "referenceLink": "https://github.com/free5gc/free5gc/security/advisories/GHSA-qj55-47fp-p62j",
  "serverity": "\u4e2d",
  "submitTime": "2026-08-03",
  "title": "free5GC\u8f93\u5165\u9a8c\u8bc1\u9519\u8bef\u6f0f\u6d1e"
}

CVE-2026-53551 (GCVE-0-2026-53551)

Vulnerability from cvelistv5 – Published: 2026-07-31 20:12 – Updated: 2026-08-03 16:26

Title

free5GC AUSF: null byte injection in supiOrSuci causes HTTP 500 internal service failure

Summary

free5GC is an open-source implementation of the 5G core network. Prior to 1.4.5, the free5GC AUSF (Authentication Server Function) does not validate the supiOrSuci field in UE authentication requests. Null bytes (\x00) and other control characters pass through JSON parsing unchanged and are forwarded to the UDM in an unescaped URL path. This causes Go's net/url.Parse() to fail, returning HTTP 500 "System failure" and leaking internal stack traces. An unauthenticated attacker can trigger this at scale causing denial of service for all subscribers attempting authentication through the affected AUSF. This vulnerability is fixed in 1.4.5.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-03 16:18 UTC

CWE

CWE-20 - Improper Input Validation

Assigner

GitHub_M mitre root

References

6 references

URL	Tags
https://github.com/free5gc/free5gc/security/advis…	x_refsource_CONFIRM
https://github.com/free5gc/free5gc/issues/1048	x_refsource_MISC
https://github.com/free5gc/ausf/pull/61	x_refsource_MISC
https://github.com/free5gc/ausf/commit/bfc4a10094…	x_refsource_MISC
https://github.com/free5gc/ausf/releases/tag/v1.4.5	x_refsource_MISC
https://github.com/free5gc/free5gc/releases/tag/v4.2.2	x_refsource_MISC

Impacted products

2 products

Vendor	Product	Version
free5gc	free5gc	Affected: < 4.2.2
free5gc	ausf	Affected: < 1.4.5

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-53551",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-03T16:18:42.205611Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-03T16:26:59.863Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/free5gc/free5gc/security/advisories/GHSA-qj55-47fp-p62j"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "free5gc",
          "vendor": "free5gc",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.2.2"
            }
          ]
        },
        {
          "product": "ausf",
          "vendor": "free5gc",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.4.5"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "free5GC is an open-source implementation of the 5G core network. Prior to 1.4.5, the free5GC AUSF (Authentication Server Function) does not validate the supiOrSuci field in UE authentication requests. Null bytes (\\x00) and other control characters pass through JSON parsing unchanged and are forwarded to the UDM in an unescaped URL path. This causes Go\u0027s net/url.Parse() to fail, returning HTTP 500 \"System failure\" and leaking internal stack traces. An unauthenticated attacker can trigger this at scale causing denial of service for all subscribers attempting authentication through the affected AUSF. This vulnerability is fixed in 1.4.5."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-20",
              "description": "CWE-20: Improper Input Validation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-31T20:12:57.932Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/free5gc/free5gc/security/advisories/GHSA-qj55-47fp-p62j",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/free5gc/free5gc/security/advisories/GHSA-qj55-47fp-p62j"
        },
        {
          "name": "https://github.com/free5gc/free5gc/issues/1048",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/free5gc/free5gc/issues/1048"
        },
        {
          "name": "https://github.com/free5gc/ausf/pull/61",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/free5gc/ausf/pull/61"
        },
        {
          "name": "https://github.com/free5gc/ausf/commit/bfc4a10094dbacbd862baa4686829f3fcc06ce1e",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/free5gc/ausf/commit/bfc4a10094dbacbd862baa4686829f3fcc06ce1e"
        },
        {
          "name": "https://github.com/free5gc/ausf/releases/tag/v1.4.5",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/free5gc/ausf/releases/tag/v1.4.5"
        },
        {
          "name": "https://github.com/free5gc/free5gc/releases/tag/v4.2.2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/free5gc/free5gc/releases/tag/v4.2.2"
        }
      ],
      "source": {
        "advisory": "GHSA-qj55-47fp-p62j",
        "discovery": "UNKNOWN"
      },
      "title": "free5GC AUSF: null byte injection in supiOrSuci causes HTTP 500 internal service failure"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-53551",
    "datePublished": "2026-07-31T20:12:57.932Z",
    "dateReserved": "2026-06-09T18:13:07.263Z",
    "dateUpdated": "2026-08-03T16:26:59.863Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.
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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-2026-37845

CVE-2026-53551 (GCVE-0-2026-53551)

Tags

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Nomenclature

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