{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-16651", "assignerOrgId": "61241ed8-fa44-4f23-92db-b8c443751968", "state": "PUBLISHED", "assignerShortName": "Temporal", "dateReserved": "2026-07-22T18:08:54.825Z", "datePublished": "2026-09-21T11:32:44.699Z", "dateUpdated": "2026-09-21T11:32:44.699Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "61241ed8-fa44-4f23-92db-b8c443751968", "shortName": "Temporal", "dateUpdated": "2026-09-21T11:32:44.699Z"}, "title": "temporalio/sqlparser malformed MySQL version comments can cause a panic", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-129", "description": "CWE-129: Improper Validation of Array Index", "type": "CWE"}]}], "impacts": [{"descriptions": [{"lang": "en", "value": "Availability degradation or denial of service caused by an uncaught Go runtime panic. No confidentiality or integrity impact was identified."}]}], "affected": [{"vendor": "Temporal Technologies, Inc.", "product": "temporalio/sqlparser", "collectionURL": "https://pkg.go.dev", "packageName": "github.com/temporalio/sqlparser", "repo": "https://github.com/temporalio/sqlparser", "modules": ["Parser"], "programFiles": ["comments.go", "token.go"], "versions": [{"status": "affected", "version": "0.0.0-20180604150908-b055e9c9b4fa", "lessThan": "0.0.0-20260721183040-74181ffcbaaf", "versionType": "semver"}], "defaultStatus": "unaffected", "programRoutines": [{"name": "ExtractMysqlComment"}, {"name": "Tokenizer.scanMySQLSpecificComment"}, {"name": "Parse"}, {"name": "ParseStrictDDL"}, {"name": "ParseNext"}]}, {"vendor": "Temporal Technologies, Inc.", "product": "Temporal Server", "collectionURL": "https://pkg.go.dev", "packageName": "go.temporal.io/server", "repo": "https://github.com/temporalio/temporal", "modules": ["Matching"], "programFiles": ["service/matching/handler.go", "service/matching/workers/worker_query_engine.go"], "programRoutines": [{"name": "Handler.ListWorkers"}, {"name": "getWhereCause"}], "versions": [{"status": "affected", "version": "1.29.0", "lessThanOrEqual": "1.29.7", "versionType": "semver"}, {"status": "affected", "version": "1.30.0", "lessThan": "1.30.7", "versionType": "semver"}, {"status": "affected", "version": "1.31.0", "lessThan": "1.31.3", "versionType": "semver"}], "defaultStatus": "unaffected", "cpes": ["cpe:2.3:a:temporal:temporal:*:*:*:*:*:*:*:*"]}], "descriptions": [{"lang": "en", "value": "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.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>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.</p>"}]}], "references": [{"url": "https://github.com/temporalio/sqlparser/pull/5", "name": "sqlparser fix pull request", "tags": ["patch"]}, {"url": "https://github.com/temporalio/sqlparser/commit/74181ffcbaaf0c52faa925f4cf27ed6c0c2be86f", "name": "sqlparser fix commit", "tags": ["patch"]}, {"url": "https://github.com/temporalio/sqlparser/tree/v0.1.0", "name": "Fixed release tag v0.1.0", "tags": ["product"]}, {"url": "https://github.com/temporalio/temporal/pull/11190", "name": "Temporal Server dependency update", "tags": ["patch"]}, {"url": "https://github.com/temporalio/temporal/pull/11090", "name": "Temporal Server matching-handler panic containment", "tags": ["patch"]}, {"url": "https://github.com/temporalio/temporal/releases/tag/v1.30.7", "name": "Temporal Server 1.30.7", "tags": ["release-notes"]}, {"url": "https://github.com/temporalio/temporal/releases/tag/v1.31.3", "name": "Temporal Server 1.31.3", "tags": ["release-notes"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "temporalio/sqlparser reasonable worst-case network service embedding"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 8.7, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "Temporal Server ListWorkers in a supported authenticated deployment"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 7.1, "vectorString": "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"}}], "configurations": [{"lang": "en", "value": "The temporalio/sqlparser CVSS scenario uses the reasonable worst case of a network service passing unauthenticated attacker-controlled SQL to the parser without same-goroutine panic recovery. Applications that embed the library should reassess the vector for their actual input, privilege, and recovery boundaries.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>The temporalio/sqlparser CVSS scenario uses the reasonable worst case of a network service passing unauthenticated attacker-controlled SQL to the parser without same-goroutine panic recovery. Applications that embed the library should reassess the vector for their actual input, privilege, and recovery boundaries.</p>"}]}, {"lang": "en", "value": "In Temporal Server 1.29.x, ListWorkers reaches the vulnerable parser only when frontend.ListWorkersEnabled is enabled; the setting defaults to false. In 1.30.x, the setting defaults to true. Beginning in 1.31.0, the setting remains defined but is no longer honored, and ListWorkers is always enabled. In supported authenticated deployments, ListWorkers requires namespace read permission.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>In Temporal Server 1.29.x, ListWorkers reaches the vulnerable parser only when frontend.ListWorkersEnabled is enabled; the setting defaults to false. In 1.30.x, the setting defaults to true. Beginning in 1.31.0, the setting remains defined but is no longer honored, and ListWorkers is always enabled. In supported authenticated deployments, ListWorkers requires namespace read permission.</p>"}]}], "workarounds": [{"lang": "en", "value": "Until upgrading, applications can reject MySQL version comments before invoking the parser or recover parser panics on the parsing goroutine. Temporal Server 1.29 and 1.30 operators can set frontend.ListWorkersEnabled to false. On any affected Server release, restrict ListWorkers to trusted principals or apply the matching-handler panic-recovery change as interim containment. Panic recovery does not replace the parser fix.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Until upgrading, applications can reject MySQL version comments before invoking the parser or recover parser panics on the parsing goroutine. Temporal Server 1.29 and 1.30 operators can set frontend.ListWorkersEnabled to false. On any affected Server release, restrict ListWorkers to trusted principals or apply the matching-handler panic-recovery change as interim containment. Panic recovery does not replace the parser fix.</p>"}]}], "solutions": [{"lang": "en", "value": "Upgrade github.com/temporalio/sqlparser to v0.0.0-20260721183040-74181ffcbaaf or later. Temporal Server operators should upgrade to 1.30.7, 1.31.3, or 1.32.0, as appropriate for the deployed minor release line. The parser fix treats MySQL version comments as ordinary comments instead of interpreting their contents as SQL.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Upgrade github.com/temporalio/sqlparser to v0.0.0-20260721183040-74181ffcbaaf or later. Temporal Server operators should upgrade to 1.30.7, 1.31.3, or 1.32.0, as appropriate for the deployed minor release line. The parser fix treats MySQL version comments as ordinary comments instead of interpreting their contents as SQL.</p>"}]}], "credits": [{"lang": "en", "value": "An external security researcher who reported this issue responsibly to Temporal Technologies", "type": "finder"}], "source": {"discovery": "EXTERNAL"}}}}

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