Service crash via unbounded expression nesting
Published Sep 21, 2026 · Updated Sep 21, 2026
Stack exhaustion in Temporal SQL Parser and Temporal Server allows remote authenticated users to crash service processes with crafted queries. The parser accepts deeply nested unary expressions without an applicable depth limit, and String or Walk recursively traverses the resulting AST until the Go stack fatally overflows. Namespace read permission is sufficient on affected Server paths; repeated requests can sustain Frontend or Matching service interruption.
Summary
What happened
Stack exhaustion in Temporal SQL Parser and Temporal Server allows remote authenticated users to crash service processes with crafted queries. The parser accepts deeply nested unary expressions without an applicable depth limit, and String or Walk recursively traverses the resulting AST until the Go stack fatally overflows. Namespace read permission is sufficient on affected Server paths; repeated requests can sustain Frontend or Matching service interruption.
The record
- CVE
- CVE-2026-65651
- Published
- Sep 21, 2026
- Updated
- Sep 21, 2026
- Vendor
- Temporal Technologies
- Product
- Temporal SQL Parser
- Classifications
- T1499.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 21, 2026CVE publishedPublication date reported by the CVE source.
- Sep 21, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0.0.0-20141206041240-1aae9baceee8 <0.0.0-20260721183058-0466b6b405ac
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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