CVE-2026-84298

LOW 3.1

Hatchet: Cross-tenant durable callback payload disclosure in Hatchet V1 Dispatcher

CVSS Score

3.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-639 CWE-862
Vendor	hatchet-dev
Product	hatchet
Published	Sep 21, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Affected Versions

hatchet-dev / hatchet

< 0.95.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/hatchet-dev/hatchet/security/advisories/GHSA-9q4h-f4x5-ffq8 github.com: https://github.com/hatchet-dev/hatchet/commit/9555bfdd1e97f61d25e614ccaa107c5fb7dc4976