Temporal Server up to 1.29.7/1.30.6/1.31.2 Frontend/Schedule Worker resource consumption

Summaryinfo

A vulnerability marked as problematic has been reported in Temporal Server up to 1.29.7/1.30.6/1.31.2. This affects an unknown function of the component Frontend/Schedule Worker. This manipulation causes resource consumption. This vulnerability is tracked as CVE-2026-16652. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Temporal Server up to 1.29.7/1.30.6/1.31.2. Affected by this vulnerability is an unknown code of the component Frontend/Schedule Worker. The manipulation with an unknown input leads to a resource consumption vulnerability. The CWE definition for the vulnerability is CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. As an impact it is known to affect availability. The summary by CVE is:

Temporal Server did not bound the work performed while searching for a Schedule's next action time. An authenticated caller with namespace write permission could create or update a Schedule that combines a fine-grained cadence with an exclusion calendar that rejects every candidate time, causing the server to evaluate excluded candidates without a per-search work budget. This can consume excessive CPU in Frontend and Schedule worker components. A persisted specification can also cause its backing Schedule Workflow to repeatedly fail and retry, allowing CPU consumption to continue without additional requests until the Schedule is deleted or its backing Workflow is terminated. Repeated or parallel exploitation can deny service. The issue affects availability only; it does not expose or modify Workflow data.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-16652 since 07/22/2026. The exploitation appears to be easy. The attack can be launched remotely. Additional levels of successful authentication are required for exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 1.30.7 or 1.31.3 eliminates this vulnerability.

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Productinfo

Vendor

• Temporal

Name

• Server

Version

• 1.29.0
• 1.29.1
• 1.29.2
• 1.29.3
• 1.29.4
• 1.29.5
• 1.29.6
• 1.29.7
• 1.30.0
• 1.30.1
• 1.30.2
• 1.30.3
• 1.30.4
• 1.30.5
• 1.30.6
• 1.31.0
• 1.31.1
• 1.31.2

CPE 2.3info

• 🔒
• 🔒
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CPE 2.2info

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• 🔒
• 🔒

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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