# CVE-2026-65651: temporalio/sqlparser deeply nested unary expressions can cause a fatal stack overflow during AST traversal

> CVE-2026-65651: temporalio/sqlparser deeply nested unary expressions can cause a fatal stack overflow during AST traversal. CVSS 8.7 (CVSS 4.0).

Canonical: https://rewindex.com/cve/CVE-2026-65651
Last updated: 2026-09-22T19:40:05Z

- Published: 2026-09-21 11:34 UTC · Updated: 2026-09-22 19:40 UTC · Assigner: Temporal
- CVSS: 8.7 (CVSS 4.0) · Severity: High
- EPSS: 0.67%, 52th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-674

## Description

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 vendors and products

- Temporal Technologies, Inc.: temporalio/sqlparser
- Temporal Technologies, Inc.: Temporal Server

## Tracked companies

- [Temporal Cloud](https://rewindex.com/company/temporal-cloud.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-65651)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-65651)
- [https://github.com/temporalio/sqlparser/commit/0466b6b405accfaa781e4bef417933efc18bcaef](https://github.com/temporalio/sqlparser/commit/0466b6b405accfaa781e4bef417933efc18bcaef)
- [https://github.com/temporalio/sqlparser/commit/1aae9baceee8e48525da8f56b07bf6a5ca7eb147](https://github.com/temporalio/sqlparser/commit/1aae9baceee8e48525da8f56b07bf6a5ca7eb147)
- [https://github.com/temporalio/sqlparser/pull/6](https://github.com/temporalio/sqlparser/pull/6)
- [https://github.com/temporalio/sqlparser/pull/7](https://github.com/temporalio/sqlparser/pull/7)
- [https://github.com/temporalio/sqlparser/tree/v0.1.0](https://github.com/temporalio/sqlparser/tree/v0.1.0)
- [https://github.com/temporalio/temporal/blob/v0.10.0/common/archiver/filestore/queryParser.go\#L77-L132](https://github.com/temporalio/temporal/blob/v0.10.0/common/archiver/filestore/queryParser.go#L77-L132)
- [https://github.com/temporalio/temporal/pull/11202](https://github.com/temporalio/temporal/pull/11202)
- [https://github.com/temporalio/temporal/releases/tag/v1.30.7](https://github.com/temporalio/temporal/releases/tag/v1.30.7)
- [https://github.com/temporalio/temporal/releases/tag/v1.31.3](https://github.com/temporalio/temporal/releases/tag/v1.31.3)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-65651 · Markdown: https://rewindex.com/cve/CVE-2026-65651.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-65651 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:11:25.246Z