CVE-2026-82426: Software Security Vulnerability Vulnerability
MODERATECVE-2026-82426 is a MODERATE (CVSS 6.5) security vulnerability vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.. Remediation is available in the latest vendor maintenance releases.
CVE-2026-82426 at a Glance
Security Impact
CVSS: 6.5
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N).
How to Fix CVE-2026-82426
To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:treeHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2026-82426, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:treeAnalyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.
Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
References
Frequently Asked Questions
What is CVE-2026-82426?
Which Software versions are affected?
What version fixes CVE-2026-82426?
What is the CVSS score of CVE-2026-82426?
What CWE is associated with CVE-2026-82426?
How can I check Maven dependencies for CVE-2026-82426?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-5wqr-qcf5-76p8",
"modified" : "2026-09-14T21:31:38Z",
"published" : "2026-09-14T15:32:48Z",
"aliases" : [ "CVE-2026-82426" ],
"details" : "Description\n\nNimbus accepted the `uploadedJarLocation` argument of `submitTopology` / `submitTopologyWithOpts` as a\nserver-side path and opened it directly, without checking that it referred to a file the caller had\nactually uploaded. The intended flow is that a client first calls `beginFileUpload`, which returns a path\ninside the Nimbus inbox, and uploads the jar in chunks to that location; nothing bound submission to that\nflow, and the `uploaders` map populated by `beginFileUpload` was never consulted at submit time.\n\nAn authenticated user with topology submission rights could therefore submit any path readable by the\nNimbus daemon user as their topology jar. Nimbus copied the file into the topology's jar blob, and the\nblob ACL grants the submitting subject read access, so the contents could then be retrieved with the\nordinary blob download RPCs. Candidate targets include the Nimbus Kerberos keytab, Thrift and UI TLS\nprivate keys, and `storm.yaml` with the ZooKeeper authentication payload. Possession of the Nimbus keytab\nturns an ordinary tenant into a cluster administrator.\n\nIn a deployment configured as the documentation recommends, submission is available to every\nauthenticated principal when `nimbus.users` is unset, so no elevated privilege is required.\n\nMitigation\n\nUpgrade to 3.1.0, where the submitted location is canonicalised and must resolve inside the Nimbus inbox.\n\nUsers who cannot upgrade immediately should restrict topology submission to trusted principals via\n`nimbus.users` or `nimbus.groups`, and should treat any file readable by the Nimbus daemon user as\npotentially exposed to submitters: rotate the Nimbus keytab and any TLS private keys or ZooKeeper\ncredentials reachable from that account. Local mode is unaffected.\n\n\nCredit\n\nIndependently reported to the Apache Storm PMC by n0mi1k, with a proof of concept.\n\nAlso found by the ASF using Claude agents to study the security of open-source projects, validated and reported by Apache Storm.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
} ],
"affected" : [ ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-82426"
}, {
"type" : "WEB",
"url" : "https://lists.apache.org/thread/cq3xzxvvhtb6brbp9nl9p8kobnvtmnwc"
}, {
"type" : "WEB",
"url" : "http://www.openwall.com/lists/oss-security/2026/09/13/6"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-22" ],
"severity" : "MODERATE",
"github_reviewed" : false,
"github_reviewed_at" : null,
"nvd_published_at" : "2026-09-14T15:17:09Z"
}
}