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GHSA-6G43-577R-WF4X

Vulnerability from github – Published: 2026-03-18 17:26 – Updated: 2026-03-20 21:20

Summary

Out-of-Bounds Slice Access in free5GC CHF Leading to DoS

Details

Impact

This is an out-of-bounds slice access vulnerability in the CHF nchf-convergedcharging service. A valid authenticated request to PUT /nchf-convergedcharging/v3/recharging/:ueId?ratingGroup=... can trigger a server-side panic in github.com/free5gc/chf/internal/sbi.(*Server).RechargePut(...) due to an out-of-range slice access. In the reported runtime, Gin recovery converts the panic into HTTP 500, but the recharge path remains remotely panic-triggerable and can be abused repeatedly to degrade recharge functionality and flood logs. In deployments without equivalent recovery handling, this panic may cause more severe service disruption.

Patches

https://github.com/free5gc/chf/pull/61

Workarounds

Restrict access to the nchf-convergedcharging recharge endpoint to strictly trusted NF callers only.
Apply rate limiting or network ACLs in front of the CHF SBI interface to reduce repeated panic-trigger attempts.
If the recharge API is not required, temporarily disable or block external reachability to this route.
Ensure panic recovery, monitoring, and alerting are enabled.

Severity

7.1 (High)


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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/free5gc/chf"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.2.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-32937"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-129"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-18T17:26:27Z",
    "nvd_published_at": "2026-03-20T03:16:00Z",
    "severity": "HIGH"
  },
  "details": "### Impact\nThis is an out-of-bounds slice access vulnerability in the CHF `nchf-convergedcharging` service.\nA valid authenticated request to PUT `/nchf-convergedcharging/v3/recharging/:ueId?ratingGroup=...` can trigger a server-side panic in `github.com/free5gc/chf/internal/sbi.(*Server).RechargePut(...)` due to an out-of-range slice access. In the reported runtime, Gin recovery converts the panic into HTTP 500, but the recharge path remains remotely panic-triggerable and can be abused repeatedly to degrade recharge functionality and flood logs. In deployments without equivalent recovery handling, this panic may cause more severe service disruption.\n\n### Patches\nhttps://github.com/free5gc/chf/pull/61\n\n### Workarounds\n- Restrict access to the `nchf-convergedcharging` recharge endpoint to strictly trusted NF callers only.\n- Apply rate limiting or network ACLs in front of the CHF SBI interface to reduce repeated panic-trigger attempts.\n- If the recharge API is not required, temporarily disable or block external reachability to this route.\n- Ensure panic recovery, monitoring, and alerting are enabled.",
  "id": "GHSA-6g43-577r-wf4x",
  "modified": "2026-03-20T21:20:37Z",
  "published": "2026-03-18T17:26:27Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/free5gc/free5gc/security/advisories/GHSA-6g43-577r-wf4x"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-32937"
    },
    {
      "type": "WEB",
      "url": "https://github.com/free5gc/free5gc/issues/864"
    },
    {
      "type": "WEB",
      "url": "https://github.com/free5gc/chf/pull/61"
    },
    {
      "type": "WEB",
      "url": "https://github.com/free5gc/chf/commit/55af766f321a00afa978e806548c96f8a7d2433e"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/free5gc/chf"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Out-of-Bounds Slice Access in free5GC CHF Leading to DoS"
}

CVE-2026-32937 (GCVE-0-2026-32937)

Vulnerability from cvelistv5 – Published: 2026-03-20 02:43 – Updated: 2026-03-20 19:56

Title

free5GC CHF has Out-of-Bounds Slice Access that Leads to DoS

Summary

free5GC is an open source 5G core network. free5GC CHF prior to version 1.2.2 has an out-of-bounds slice access vulnerability in the CHF `nchf-convergedcharging` service. A valid authenticated request to PUT `/nchf-convergedcharging/v3/recharging/:ueId?ratingGroup=...` can trigger a server-side panic in `github.com/free5gc/chf/internal/sbi.(*Server).RechargePut(...)` due to an out-of-range slice access. In the reported runtime, Gin recovery converts the panic into HTTP 500, but the recharge path remains remotely panic-triggerable and can be abused repeatedly to degrade recharge functionality and flood logs. In deployments without equivalent recovery handling, this panic may cause more severe service disruption. free5GC CHF patches the issue. Some workarounds are available: Restrict access to the `nchf-convergedcharging` recharge endpoint to strictly trusted NF callers only; apply rate limiting or network ACLs in front of the CHF SBI interface to reduce repeated panic-trigger attempts; if the recharge API is not required, temporarily disable or block external reachability to this route; and/or ensure panic recovery, monitoring, and alerting are enabled.

Severity

7.1 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-20 19:55 UTC

CWE

CWE-129 - Improper Validation of Array Index

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/864	x_refsource_MISC
https://github.com/free5gc/chf/pull/61	x_refsource_MISC
https://github.com/free5gc/chf/commit/55af766f321…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
free5gc	chf	Affected: < 1.2.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-32937",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-20T19:55:24.210377Z",
                "version": "2.0.3"
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        "providerMetadata": {
          "dateUpdated": "2026-03-20T19:56:21.132Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
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          "vendor": "free5gc",
          "versions": [
            {
              "status": "affected",
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            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
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        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
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            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
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          }
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      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-129",
              "description": "CWE-129: Improper Validation of Array Index",
              "lang": "en",
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-20T02:43:18.754Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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      "references": [
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        },
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          "tags": [
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          "url": "https://github.com/free5gc/free5gc/issues/864"
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          "url": "https://github.com/free5gc/chf/commit/55af766f321a00afa978e806548c96f8a7d2433e"
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      "source": {
        "advisory": "GHSA-6g43-577r-wf4x",
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      "title": "free5GC CHF has Out-of-Bounds Slice Access that Leads to DoS"
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    "dateReserved": "2026-03-17T00:05:53.282Z",
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    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
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}

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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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.

Detection rules are retrieved from Rulezet.

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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