CVE-2026-84298 Hatchet: Cross-tenant durable callback payload disclosure in Hatchet V1 Dispatcher
An authenticated worker can read another tenant's durable callback payload by knowing the task UUID, exposing sensitive workflow data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-84298?
CVE-2026-84298 is a low-severity missing authorization vulnerability in hatchet-dev hatchet, published on 21 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Which versions are affected by CVE-2026-84298?
3 open source packages ship an affected version, including github.com/hatchet-dev/hatchet.
| Package | Affected | Fixed in |
|---|---|---|
github.com/hatchet-dev/hatchet Go | All versions | 0.95.3 |
github.com/hatchet-dev/hatchet Go | All versions | 0.95.3 |
github.com/hatchet-dev/hatchet Go | All versions | 0.95.3 |
How do I fix CVE-2026-84298?
Upgrade github.com/hatchet-dev/hatchet to 0.95.3 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-84298 being exploited?
There is no known exploitation of CVE-2026-84298 in the wild and no public exploit code.
Sources
Also known as GHSA-9q4h-f4x5-ffq8, GO-2026-6561.