CVE-2026-82432

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-09-14. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
8.1
EG Score
8.1(high)
EG Risk
37(Track)
EG Risk 37/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity81% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
28%
KEV
Not listed

Published

September 14, 2026

Last Modified

September 14, 2026

Advisory Details (2)

Auto-updated Sep 14, 2026
No patch confirmed yet.
generic

oss-security - CVE-2026-82432: Apache Storm Nimbus: Blobstore Authorization Bypass via Rebalance Configuration Overrides

http://www.openwall.com/lists/oss-security/2026/09/13/12
generic
https://lists.apache.org/thread/psy1gj77jhf9y3lhph9yz4f5fovmkz7b

Vendor Advisories for CVE-2026-82432(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 29× in last 7d / 50× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-25 08:33 UTCGHSA enrichment
  2. 2026-09-24 21:42 UTCEG score recompute
  3. 2026-09-24 21:42 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-24 10:26 UTCGHSA enrichment
  6. 2026-09-23 23:35 UTCEG score recompute
  7. 2026-09-23 23:35 UTCGHSA enrichment
  8. 2026-09-23 17:54 UTCEPSS rescore
  9. 2026-09-23 12:44 UTCGHSA enrichment
  10. 2026-09-23 01:53 UTCEG score recompute
  11. 2026-09-23 01:53 UTCGHSA enrichment
  12. 2026-09-22 16:01 UTCEPSS rescore
  13. 2026-09-22 15:02 UTCGHSA enrichment
  14. 2026-09-22 04:10 UTCEG score recompute
  15. 2026-09-22 04:10 UTCGHSA enrichment
  16. 2026-09-21 21:09 UTCEPSS rescore
  17. 2026-09-21 17:20 UTCGHSA enrichment
  18. 2026-09-21 06:28 UTCEG score recompute
  19. 2026-09-21 06:28 UTCGHSA enrichment
  20. 2026-09-20 20:16 UTCEPSS rescore
  21. 2026-09-20 19:37 UTCGHSA enrichment
  22. 2026-09-20 08:46 UTCGHSA enrichment
  23. 2026-09-19 21:54 UTCEG score recompute
  24. 2026-09-19 21:54 UTCGHSA enrichment
  25. 2026-09-19 11:03 UTCGHSA enrichment
Show 25 more
  1. 2026-09-19 00:12 UTCEG score recompute
  2. 2026-09-19 00:12 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 13:21 UTCGHSA enrichment
  5. 2026-09-18 02:30 UTCEG score recompute
  6. 2026-09-18 02:30 UTCGHSA enrichment
  7. 2026-09-17 15:39 UTCGHSA enrichment
  8. 2026-09-17 04:48 UTCGHSA enrichment
  9. 2026-09-16 17:56 UTCEG score recompute
  10. 2026-09-16 17:56 UTCGHSA enrichment
  11. 2026-09-16 14:08 UTCEPSS rescore
  12. 2026-09-16 05:37 UTCEG score recompute
  13. 2026-09-16 05:37 UTCGHSA enrichment
  14. 2026-09-16 05:15 UTCEPSS rescore
  15. 2026-09-15 18:46 UTCGHSA enrichment
  16. 2026-09-15 07:55 UTCEG score recompute
  17. 2026-09-15 07:55 UTCGHSA enrichment
  18. 2026-09-14 21:03 UTCGHSA enrichment
  19. 2026-09-14 20:24 UTCGHSA enrichment
  20. 2026-09-14 20:15 UTCEG score recompute▲ 8.10
  21. 2026-09-14 20:15 UTCGHSA enrichment
  22. 2026-09-14 20:14 UTCMITRE cvelistV5CVSS v3 → 8.1 · severity → HIGH
  23. 2026-09-14 15:21 UTCNVD update
  24. 2026-09-14 14:25 UTCEG score recompute
  25. 2026-09-14 14:24 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-82432?
CVE-2026-82432 is a high vulnerability published on September 14, 2026. 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…
When was CVE-2026-82432 disclosed?
CVE-2026-82432 was first published in the National Vulnerability Database on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-82432 actively exploited?
CVE-2026-82432 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 71.9% of all scored CVEs.
What is the CVSS score of CVE-2026-82432?
CVE-2026-82432 has a CVSS v3.1 base score of 8.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-82432?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82432, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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