Vulnerability-Lookup

CVE-2026-82432 (GCVE-0-2026-82432)

Vulnerability from cvelistv5 – Published: 2026-09-14 14:11 – Updated: 2026-09-14 20:03

Title

Apache Storm Nimbus: Blobstore Authorization Bypass via Rebalance Configuration Overrides

Summary

Description Nimbus validated `topology.blobstore.map` against the calling subject at submission time only. The rebalance operation accepts configuration overrides and stripped a small set of keys from them, but never re-ran that validation, so a caller authorised to rebalance a topology could introduce a blobstore map entry naming a blob whose ACL does not grant them access. Supervisors localise whatever key the map names, placing the blob's contents into the topology's working directory. The same advisory covers `listBlobs`, which performed no authorization check and passed no subject, unlike the neighbouring `getBlobMeta` and `beginBlobDownload` operations. It therefore returned every key in the blobstore to any caller able to reach the Nimbus Thrift port, which provides the key names that make the above practical. On its own the disclosure is metadata only. Mitigation Upgrade to 3.1.0, where rebalance configuration overrides are validated exactly as submission-time configuration is, against the rebalancing caller, and where `listBlobs` applies the configured authorization. Users who cannot upgrade immediately should restrict rebalance rights to trusted principals, keeping in mind that membership of a topology's `topology.users` or `topology.groups` confers them. Credit The ASF -- found using Claude agents to study the security of open-source projects, validated and reported by Apache Storm.

Severity

8.1 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-14 20:03 UTC

CWE

CWE-863 - Incorrect Authorization

Assigner

apache mitre root

References

2 references

URL	Tags
https://lists.apache.org/thread/psy1gj77jhf9y3lhp…	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/0…

Impacted products

1 product

Vendor	Product	Version	CPE status
Apache Software Foundation	Apache Storm Nimbus	Affected: 3.0.0 , < 3.1.0 (semver)	guessed

Credits

The ASF using Claude Agents

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-82432

Vulnerability from fkie_nvd - Published: 2026-09-14 15:17 - Updated: 2026-09-14 20:58

Severity

8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Summary

References

	URL	Tags
	security@apache.org	https://lists.apache.org/thread/psy1gj77jhf9y3lhph9yz4f5fovmkz7b
	af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/09/13/12

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://repo.maven.apache.org/maven2",
          "defaultStatus": "unaffected",
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    }
  ],
  "id": "CVE-2026-82432",
  "lastModified": "2026-09-14T20:58:48.430",
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}

GHSA-HW7R-WM97-CF8J

Vulnerability from github – Published: 2026-09-14 15:32 – Updated: 2026-09-14 21:31

Details

Description

Nimbus validated topology.blobstore.map against the calling subject at submission time only. The rebalance operation accepts configuration overrides and stripped a small set of keys from them, but never re-ran that validation, so a caller authorised to rebalance a topology could introduce a blobstore map entry naming a blob whose ACL does not grant them access. Supervisors localise whatever key the map names, placing the blob's contents into the topology's working directory.

The same advisory covers listBlobs, which performed no authorization check and passed no subject, unlike the neighbouring getBlobMeta and beginBlobDownload operations. It therefore returned every key in the blobstore to any caller able to reach the Nimbus Thrift port, which provides the key names that make the above practical. On its own the disclosure is metadata only.

Mitigation

Upgrade to 3.1.0, where rebalance configuration overrides are validated exactly as submission-time configuration is, against the rebalancing caller, and where listBlobs applies the configured authorization.

Users who cannot upgrade immediately should restrict rebalance rights to trusted principals, keeping in mind that membership of a topology's topology.users or topology.groups confers them.

Credit

The ASF -- found using Claude agents to study the security of open-source projects, validated and reported by Apache Storm.

Severity

8.1 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-82432"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-863"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-14T15:17:10Z",
    "severity": "HIGH"
  },
  "details": "Description\n\nNimbus validated `topology.blobstore.map` against the calling subject at submission time only. The rebalance\noperation accepts configuration overrides and stripped a small set of keys from them, but never re-ran that\nvalidation, so a caller authorised to rebalance a topology could introduce a blobstore map entry naming a\nblob whose ACL does not grant them access. Supervisors localise whatever key the map names, placing the\nblob\u0027s contents into the topology\u0027s working directory.\n\nThe same advisory covers `listBlobs`, which performed no authorization check and passed no subject, unlike\nthe neighbouring `getBlobMeta` and `beginBlobDownload` operations. It therefore returned every key in the\nblobstore to any caller able to reach the Nimbus Thrift port, which provides the key names that make the\nabove practical. On its own the disclosure is metadata only.\n\nMitigation\n\nUpgrade to 3.1.0, where rebalance configuration overrides are validated exactly as submission-time\nconfiguration is, against the rebalancing caller, and where `listBlobs` applies the configured\nauthorization.\n\nUsers who cannot upgrade immediately should restrict rebalance rights to trusted principals, keeping in mind\nthat membership of a topology\u0027s `topology.users` or `topology.groups` confers them.\n\nCredit\n\nThe ASF -- found using Claude agents to study the security of open-source projects, validated and reported by Apache Storm.",
  "id": "GHSA-hw7r-wm97-cf8j",
  "modified": "2026-09-14T21:31:40Z",
  "published": "2026-09-14T15:32:49Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-82432"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread/psy1gj77jhf9y3lhph9yz4f5fovmkz7b"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/09/13/12"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

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.

Action not permitted

CVE-2026-82432 (GCVE-0-2026-82432)

FKIE_CVE-2026-82432

GHSA-HW7R-WM97-CF8J

Tags

Sightings

Nomenclature