# CVE-2026-16651: temporalio/sqlparser malformed MySQL version comments can cause a panic

> CVE-2026-16651: temporalio/sqlparser malformed MySQL version comments can cause a panic. CVSS 8.7 (CVSS 4.0).

Canonical: https://rewindex.com/cve/CVE-2026-16651
Last updated: 2026-09-22T19:40:05Z

- Published: 2026-09-21 11:32 UTC · Updated: 2026-09-22 19:40 UTC · Assigner: Temporal
- CVSS: 8.7 (CVSS 4.0) · Severity: High
- EPSS: 0.53%, 45th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-129

## Description

temporalio/sqlparser can panic when Parse, ParseStrictDDL, or ParseNext processes a MySQL version comment whose contents are empty or consist only of one to five decimal digits. ExtractMysqlComment does not check the -1 result returned by strings.IndexFunc before using it as a slice boundary. The resulting Go runtime panic propagates unless the caller recovers it on the parsing goroutine, so applications that parse attacker-controlled SQL can terminate. Temporal Server exposes the affected parser through ListWorkers. When that API is enabled, an authenticated caller with namespace read permission can submit a malformed query that terminates the receiving Matching process. 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-2026-16651)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-16651)
- [https://github.com/temporalio/sqlparser/commit/74181ffcbaaf0c52faa925f4cf27ed6c0c2be86f](https://github.com/temporalio/sqlparser/commit/74181ffcbaaf0c52faa925f4cf27ed6c0c2be86f)
- [https://github.com/temporalio/sqlparser/pull/5](https://github.com/temporalio/sqlparser/pull/5)
- [https://github.com/temporalio/sqlparser/tree/v0.1.0](https://github.com/temporalio/sqlparser/tree/v0.1.0)
- [https://github.com/temporalio/temporal/pull/11090](https://github.com/temporalio/temporal/pull/11090)
- [https://github.com/temporalio/temporal/pull/11190](https://github.com/temporalio/temporal/pull/11190)
- [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-2026-16651 · Markdown: https://rewindex.com/cve/CVE-2026-16651.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-16651 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T04:04:39.759Z