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3.1
CVE-2026-84298: Hatchet V1 Dispatcher can leak task data across tenants
CVE-2026-84298 · published 28 days ago
Summary
If you run Hatchet version earlier than 0.95.3, a worker from one customer could see the result of another customer's background task when it knows the task's unique ID. This only applies to multi‑tenant setups and requires the attacker to keep a connection open. Upgrade Hatchet to version 0.95.3 or later to stop the cross‑tenant data exposure.
What to do
- Update hatchet-dev github.com/hatchet-dev/hatchet to version 0.95.3.
- Update github.com hatchet-dev to version 0.95.3.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Go | hatchet-dev | github.com/hatchet-dev/hatchet |
< 0.95.3 Fix: upgrade to 0.95.3
|
| go | github.com | hatchet-dev |
< 0.95.3 Fix: upgrade to 0.95.3
|
| – | hatchet-dev | hatchet | < 0.95.3 |
Original advisory text
Hatchet: Cross-tenant durable callback payload disclosure in Hatchet V1 Dispatcher
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.
References
- https://github.com/hatchet-dev/hatchet/security/advisories/GHSA-9q4h-f4x5-ffq8
- https://github.com/hatchet-dev/hatchet/commit/9555bfdd1e97f61d25e614ccaa107c5fb7...
- https://nvd.nist.gov/vuln/detail/CVE-2026-84298
- https://github.com/advisories/GHSA-9q4h-f4x5-ffq8
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84298... Vendor Advisory
- https://github.com/hatchet-dev/hatchet Product
Internet-facing
60 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit
- Gives an attacker partial control
Type
CWE-639Authorization Bypass Through User-Controlled Key
CWE-862Missing Authorization
Timeline
Published21 Sep 2026
Updated19 Oct 2026
First seen21 Sep 2026
Sources
CVE-2026-84298 · NVD
CVE-2026-84298 · MITRE
GHSA-9q4h-f4x5-ffq8 · GHSA
CVE-2026-84298 · OSV
GHSA-9q4h-f4x5-ffq8 · OSV
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