CVE-2026-82427
Description A topology's `topology.blobstore.map` lets the submitter choose a local name for each blob that the supervisor localises. That name was used to build a path under the topology's working directory without normalisation, in both `AsyncLocalizer` and `Container.createBlobstoreLinks`, and the symlink helper force-deletes whatever already exists at the target before creating the link. A submitter could therefore use `../` segments to direct that delete-and-symlink operation at an arbitrary path, as the supervisor user, on every node the topology is scheduled onto. The consequences include recursive deletion of supervisor-owned content and planting a symlink that causes a subsequent worker launch to execute attacker-chosen code as another tenant's operating-system user, which defeats the isolation that `supervisor.run.worker.as.user` is intended to provide. Mitigation Upgrade to 3.1.0, where the resolved target must lie inside the expected root at both call sites. Users who cannot upgrade immediately should restrict topology submission to trusted principals, and may reject submissions whose `topology.blobstore.map` entries contain path separators or `..` segments before they reach Nimbus. Credit The ASF -- found using Claude agents to study the security of open-source projects, validated and reported by Apache Storm.
Scoring
- Severity
- HIGH
- CVSS base score
- 7.8
- CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS probability
- 0.17%
- CWE
- CWE-22
- Published
- 2026-09-14
- Last modified
- 2026-09-14
Affected products
- Apache Software Foundation Apache Storm Nimbus
Weakness type
Related vulnerabilities
- CVE-2026-85706 — Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in GitLab
- CVE-2026-78657 — SigmaForms Pro <= 1.4.11 - Unauthenticated Arbitrary File Deletion via Path Traversal in File Upload Field
- CVE-2026-61560 — @zereight/mcp-gitlab's unauthenticated arbitrary file read via `upload_markdown` enables PAT exfiltration and full account takeover
- CVE-2026-82100 — DataStage on Cloud Pak for Data has several vulnerabilities due to open source software
- CVE-2026-82954 — Dokploy Settings application.ts writeTraefikConfigInPath path traversal
- CVE-2026-82460 — Cloud Commander before 19.20.2 Directory Traversal via REST and Markdown
- CVE-2026-85661 — excel-mcp-server 0.1.8 Arbitrary File Read/Write via stdio mode
- CVE-2026-89040 — Tencent Mass Service Engine in Cluster (MSEC) path traversal