Auth bypass in Hatchet-Dev Hatchet
CVE-2026-84298
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
CVSS v3 metric
CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N.
Affected products
- Hatchet-dev Hatchet — versions < 0.95.3
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-84298?
- CVE-2026-84298 is a low-severity vulnerability in Hatchet-Dev Hatchet, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 3.1/10. Published 2026-09-21.
- How severe is CVE-2026-84298?
- Low severity. CVSS v3 base score is 3.1 out of 10.