CVE-2026-88978: Github.com/hatchet dev/hatchet Hatchet DurableTask WorkerStatus GRPC Resolves Vulnerability
MODERATECVE-2026-88978 is a MODERATE (CVSS 4.3) hatchet durabletask workerstatus grpc resolves vulnerability (CWE-639: Authorization Bypass Through User-Controlled Key) affecting Github.com/hatchet dev/hatchet libraries in the Go ecosystem. The issue involves hatchet durabletask workerstatus grpc resolves caller-supplied durable-task uuids via listsatisfiedentries with no tenant_id filter. Remediation is available by upgrading affected packages to version 0.106.1.
CVE-2026-88978 at a Glance
Security Impact
CVSS: 4.3
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N).
How to Fix CVE-2026-88978
To remediate this vulnerability, upgrade all affected Github.com/hatchet dev/hatchet dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade github.com/hatchet-dev/hatchet to 0.106.1Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for github.com/hatchet-dev/hatchetHow to Check if You Are Affected
To determine whether your application is affected by CVE-2026-88978, inspect your project dependencies for Github.com/hatchet dev/hatchet:
inspect dependencies for github.com/hatchet-dev/hatchetAnalyze the terminal output to locate any version of Github.com/hatchet dev/hatchet in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.106.1), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-639: Authorization Bypass Through User-Controlled Key, where the system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. In Github.com/hatchet dev/hatchet, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-88978 Affected Github.com/hatchet dev/hatchet Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
github.com/hatchet-dev/hatchet
|
Go |
< 0.106.1
|
0.106.1
|
References
Frequently Asked Questions
What is CVE-2026-88978?
Which Github.com/hatchet dev/hatchet versions are affected?
What version fixes CVE-2026-88978?
Is github.com/hatchet-dev/hatchet affected?
What is the CVSS score of CVE-2026-88978?
What CWE is associated with CVE-2026-88978?
How can I check Go dependencies for CVE-2026-88978?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-992g-9cr3-vm5x",
"modified" : "2026-09-22T20:40:46Z",
"published" : "2026-09-22T20:40:46Z",
"aliases" : [ "CVE-2026-88978" ],
"summary" : "Hatchet DurableTask WorkerStatus gRPC resolves caller-supplied durable-task UUIDs via ListSatisfiedEntries with no tenant_id filter",
"details" : "# Cross-tenant disclosure risk on `DurableTask` bidi RPC\n\nThis is a low-severity, low-risk cross-tenant data exposure vuln caused by blindly accepting a durable task id, in addition to a list of node and branch ids that identify records in that task's event log, and returning them to the caller via the `handleWorkerStatus` polling path.\n\n# Impact\n\nThis advisory requires an attacker to successfully guess a durable task's external uuid belonging to another tenant. External ids are generated uuid v4s (`uuid.New()` in Go), so exploitation requires prior knowledge of a target task UUID through an out-of-band channel. Thus, while the following environments are impacted, there is an extremely low probability it would be exploited.\n\n### Who is impacted. Any Hatchet deployment that hosts more than one tenant on the same instance:\n\n* Hatchet Cloud (multi-tenant SaaS)\n* Self-hosted Hatchet with multiple internal teams / business units sharing one instance\n* Any deployment where a single tenant's API token can be obtained by an attacker\n\nSingle-tenant self-hosted deployments are unaffected in practice (the \"victim\" and \"attacker\" tenants would be the same).",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/hatchet-dev/hatchet"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "0.106.1"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/hatchet-dev/hatchet/security/advisories/GHSA-992g-9cr3-vm5x"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-88978"
}, {
"type" : "WEB",
"url" : "https://github.com/hatchet-dev/hatchet/commit/15bc7923d3a8ebfeb0d88c19160dd24828921e85"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/hatchet-dev/hatchet"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-639", "CWE-863" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2026-09-22T20:40:46Z",
"nvd_published_at" : "2026-09-21T16:17:26Z"
}
}