CVE-2026-65651: Temporal Technologies, Inc Temporal Server

High severity, CVSS 8.7. EPSS: 0.7% chance of exploitation in the next 30 days.

temporalio/sqlparser accepts SQL containing deeply nested unary expressions and can return a correspondingly deep abstract syntax tree without enforcing an applicable nesting limit. The library's String and Walk operations recursively traverse that tree. An application that parses attacker-controlled SQL and later formats or walks the returned tree can encounter a runtime-fatal Go stack overflow that terminates the process; Go panic recovery cannot contain this condition. Temporal Server passes caller-controlled query input through the affected parser in archival, visibility, and worker-query paths. In affected validation paths, the Server recursively formats an invalid expression while constructing an error. In a supported authenticated deployment, a caller with namespace read permission can terminate the receiving Frontend or Matching process. The dynamically confirmed ListWorkers route additionally requires at least one retained worker heartbeat. Repeated requests can sustain a denial of service. The issue affects availability only; no confidentiality or integrity impact was identified.

Affected products

• Temporal Technologies, Inc Temporal Server: from 0.10.0, up to and including 1.29.7; from 1.30.0, before 1.30.7 (fixed in 1.30.7); from 1.31.0, before 1.31.3 (fixed in 1.31.3)
• Temporal Technologies, Inc Temporalio/sqlparser: from 0.0.0-20141206041240-1aae9baceee8, before 0.0.0-20260721183058-0466b6b405ac (fixed in 0.0.0-20260721183058-0466b6b405ac)

Published 2026-09-21. Last modified 2026-09-22.