CVE-2026-82434

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-14. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

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

Description

When ZooKeeper authentication is configured, Storm deliberately retains storm.zookeeper.topology.auth.payload in the topology configuration, because workers need it. Nimbus then served that configuration verbatim to any caller holding read-only topology permissions, so a user whose only grant was the ability to view a topology received its ZooKeeper credential.

That credential is not read-only. The cluster state implementation uses write-capable ACLs for worker heartbeats, backpressure and error state, so a recipient can forge or remove that state for the topology concerned. It is not a write credential on assignments.

The same advisory covers the submission client, which logged the generated payload at INFO on every submission that generated one, and the SASL handlers, which logged it at DEBUG. The credential therefore also reached any log aggregation or support bundle collected from the cluster.

Mitigation

Upgrade to 3.1.0, where the payload is removed from the configuration served to read-only callers and is no longer written to logs.

Users who cannot upgrade immediately should rotate storm.zookeeper.topology.auth.payload for existing topologies, review retained logs and support bundles for the value, and restrict read-only topology permissions to trusted principals.

Credit

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

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
41%
KEV
Not listed

Published

September 14, 2026

Last Modified

September 14, 2026

Advisory Details (3)

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

oss-security - Re: CVE-2026-82434: Apache Storm Nimbus, Apache Storm Client: Disclosure of the Topology ZooKeeper Credential to Read-Only Users and to Logs

http://www.openwall.com/lists/oss-security/2026/09/13/23
generic

oss-security - CVE-2026-82434: Apache Storm Nimbus, Apache Storm Client: Disclosure of the Topology ZooKeeper Credential to Read-Only Users and to Logs

http://www.openwall.com/lists/oss-security/2026/09/13/14
generic
https://lists.apache.org/thread/1t7hggrz59rdq792qm1pnkqj0ogm2szq

Vendor Advisories for CVE-2026-82434(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 22× in last 7d / 22× 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. 2026-09-20 15:31 UTCGHSA enrichment
  2. 2026-09-19 16:52 UTCEG score recompute
  3. 2026-09-19 16:52 UTCGHSA enrichment
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 18:13 UTCGHSA enrichment
  6. 2026-09-17 19:33 UTCEG score recompute
  7. 2026-09-17 19:33 UTCGHSA enrichment
  8. 2026-09-16 18:21 UTCEG score recompute
  9. 2026-09-16 18:21 UTCGHSA enrichment
  10. 2026-09-16 14:08 UTCEPSS rescore
  11. 2026-09-16 05:15 UTCEPSS rescore
  12. 2026-09-15 19:42 UTCEG score recompute
  13. 2026-09-15 19:42 UTCGHSA enrichment
  14. 2026-09-14 21:03 UTCGHSA enrichment
  15. 2026-09-14 20:24 UTCGHSA enrichment
  16. 2026-09-14 19:55 UTCEG score recompute▼ 3.50
  17. 2026-09-14 19:55 UTCGHSA enrichment
  18. 2026-09-14 19:54 UTCMITRE cvelistV5CVSS v3 → 6.5 · severity → MEDIUM
  19. 2026-09-14 19:09 UTCGHSA enrichment
  20. 2026-09-14 15:21 UTCEG score recompute
  21. 2026-09-14 14:25 UTCEG score recompute
  22. 2026-09-14 14:24 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-82434?
CVE-2026-82434 is a medium vulnerability published on September 14, 2026. Description When ZooKeeper authentication is configured, Storm deliberately retains storm.zookeeper.topology.auth.payload in the topology configuration, because workers need it. Nimbus then served that configuration verbatim to any caller holding read-only topology permissions, so a user whose only…
When was CVE-2026-82434 disclosed?
CVE-2026-82434 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-2026-82434 actively exploited?
CVE-2026-82434 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 59.5% of all scored CVEs.
What is the CVSS score of CVE-2026-82434?
CVE-2026-82434 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-82434?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82434, 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.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-82434

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