01 Record

CVE-2026-16652

Temporal Server Schedule exclusion search can cause excessive CPU consumption

HighPUBLISHEDCNA: Temporal

CNA base score7.1 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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02 Description

Temporal Server Schedule exclusion search can cause excessive CPU consumption

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.46% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 40.0% of scored records. A rank, not a probability.

NVD base score

7.1 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Awaiting Analysis. NVD last modified this record on 2026-09-22.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2026-09-21 11:23Z1 MO AGO

Last updated

2026-09-21 15:33Z1 MO AGO

Reserved

2026-07-22

Assigning CNA

Temporal

Record state

PUBLISHED

Severity

High (CVSS 7.1)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Weaknesses

CWE-606Unchecked Input for Loop ConditionBase

Data version

5.2

Document digest

e51ab53f2110666370f6b1082706e9d6a7cefd498765b6dc95c2e4a9d57badaa

05 Affected products

VendorProductVersionsPlatforms

Temporal Technologies, Inc.Temporal Server1.17.0 to 1.29.7, 1.30.0 to < 1.30.7, 1.31.0 to < 1.31.3—

06 References

github.comFix pull requesthttps://github.com/temporalio/temporal/pull/11014patch
github.comFix commithttps://github.com/temporalio/temporal/commit/c10c730e53ae394fffaefe44ba3722150fe40720patch
github.comTemporal Server 1.30.7https://github.com/temporalio/temporal/releases/tag/v1.30.7release-notes
github.comTemporal Server 1.31.3https://github.com/temporalio/temporal/releases/tag/v1.31.3release-notes

07 Remediation

Upgrade to Temporal Server 1.30.7, 1.31.3, or 1.32.0, as appropriate for the deployed minor release line, and retain a positive scheduler.specMaxIterations value. The fix bounds the number of excluded candidates evaluated by each next-action search and stops the search with an error when the bound is reached. Review and replace or remove Schedule specifications that exceed the configured bound. Setting scheduler.specMaxIterations to zero or a negative value disables the hard bound.