Vulnerability · Published Sep 21, 2026 · Assigned by GitHub_M
CVE-2026-63342Hatchet: Cross-Tenant Durable Task Event Log Disclosure via Missing Authorization Check
Medium 6.3
In plain English
A medium-severity incorrect authorization in hatchet from hatchet-dev. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Hatchet is a platform for orchestrating background tasks, AI agents, and durable workflows at scale. Prior to 0.91.1, api-contracts/openapi/paths/v1/workflow-runs/workflow_run.yaml defines the GET /api/v1/stable/durable-tasks/{durable-task} endpoint implemented by listDurableEventLog without requiring the target tenant as a parent resource, allowing an authenticated user who obtains another tenant's durable task UUID to read that task's event log. Disclosed data can include task display names, workflow identifiers, user messages, wait conditions, branching logic, and timing information. This issue is fixed in version 0.91.1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/hatchet-dev/hatchet | 0.91.1 | GHSA-g26x-m427-f48f |
| Go | github.com/hatchet-dev/hatchet | 0.91.1 | GO-2026-6567 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| hatchet-dev | hatchet | < 0.91.1 |
Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N