Vulnerability · Published Sep 21, 2026 · Assigned by GitHub_M
CVE-2026-84298Hatchet: Cross-tenant durable callback payload disclosure in Hatchet V1 Dispatcher
Low 3.1
In plain English
A low-severity authorization bypass via user-controlled key 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 0.2% (higher than 16% 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 0.95.3, the V1 DurableTask stream handler stores worker-supplied task_external_id values in the durableInvocations routing map before tenant ownership is verified, and callback delivery resolves that map by task UUID without tenant identity. An authenticated tenant worker that knows another tenant's durable task UUID and keeps a stream open on the same dispatcher process can receive that task's durable callback result payload. UUIDv4 values are not enumerable, and single-tenant deployments are unaffected in practice. This issue is fixed in version 0.95.3.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/hatchet-dev/hatchet | 0.95.3 | GHSA-9q4h-f4x5-ffq8 |
| Go | github.com/hatchet-dev/hatchet | 0.95.3 | GO-2026-6561 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| hatchet-dev | hatchet | < 0.95.3 |
Weakness: CWE-639, CWE-862 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N