{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-65651", "assignerOrgId": "61241ed8-fa44-4f23-92db-b8c443751968", "state": "PUBLISHED", "assignerShortName": "Temporal", "dateReserved": "2026-07-22T18:08:48.925Z", "datePublished": "2026-09-21T11:34:05.930Z", "dateUpdated": "2026-09-21T11:34:05.930Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "61241ed8-fa44-4f23-92db-b8c443751968", "shortName": "Temporal", "dateUpdated": "2026-09-21T11:34:05.930Z"}, "title": "temporalio/sqlparser deeply nested unary expressions can cause a fatal stack overflow during AST traversal", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-674", "description": "CWE-674: Uncontrolled Recursion", "type": "CWE"}]}], "impacts": [{"descriptions": [{"lang": "en", "value": "Denial of service caused by runtime-fatal Go stack exhaustion and process termination. 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": ["AST", "Parser"], "programFiles": ["ast.go", "sql.y"], "programRoutines": [{"name": "Parse"}, {"name": "ParseStrictDDL"}, {"name": "ParseNext"}, {"name": "String"}, {"name": "Walk"}, {"name": "UnaryExpr.Format"}], "versions": [{"status": "affected", "version": "0.0.0-20141206041240-1aae9baceee8", "lessThan": "0.0.0-20260721183058-0466b6b405ac", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Temporal Technologies, Inc.", "product": "Temporal Server", "collectionURL": "https://pkg.go.dev", "packageName": "go.temporal.io/server", "repo": "https://github.com/temporalio/temporal", "modules": ["Archival", "Frontend", "Matching", "Visibility"], "programFiles": ["common/archiver/filestore/queryParser.go", "common/persistence/visibility/store/query/converter.go", "common/persistence/visibility/store/sql/query_converter.go", "service/matching/workers/worker_query_engine.go"], "programRoutines": [{"name": "queryParser.convertComparisonExpr"}, {"name": "QueryConverter.convertComparisonExpr"}, {"name": "comparisonExprConverter.Convert"}, {"name": "workerQueryEngine.evaluateComparison"}], "versions": [{"status": "unknown", "version": "0.0.0", "lessThan": "0.10.0", "versionType": "semver"}, {"status": "affected", "version": "0.10.0", "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 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.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>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.</p>"}]}], "references": [{"url": "https://github.com/temporalio/sqlparser/commit/1aae9baceee8e48525da8f56b07bf6a5ca7eb147", "name": "First affected sqlparser source revision", "tags": ["product"]}, {"url": "https://github.com/temporalio/sqlparser/pull/6", "name": "sqlparser nested-expression fix pull request", "tags": ["patch"]}, {"url": "https://github.com/temporalio/sqlparser/commit/0466b6b405accfaa781e4bef417933efc18bcaef", "name": "First fixed sqlparser 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/sqlparser/pull/7", "name": "Broader sqlparser AST-depth hardening", "tags": ["patch"]}, {"url": "https://github.com/temporalio/temporal/pull/11202", "name": "Temporal Server dependency update", "tags": ["patch"]}, {"url": "https://github.com/temporalio/temporal/blob/v0.10.0/common/archiver/filestore/queryParser.go#L77-L132", "name": "Temporal Server 0.10.0 source-confirmed archival route", "tags": ["product"]}, {"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 visibility or archival query path 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"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "Dynamically confirmed Temporal Server ListWorkers path with retained worker state"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "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": "MEDIUM", "baseScore": 6, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/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 and then invoking String or Walk on the resulting AST. Applications that embed the library should reassess the vector for their actual input and privilege 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 and then invoking String or Walk on the resulting AST. Applications that embed the library should reassess the vector for their actual input and privilege boundaries.</p>"}]}, {"lang": "en", "value": "The known affected Temporal Server lower bound is 0.10.0, based on a source-confirmed built-in filestore visibility-archival query path; earlier Server releases are unknown. Additional source-confirmed SQL and Elasticsearch visibility paths begin in later releases. These routes do not require retained worker state. Their availability depends on the deployed visibility or archival configuration, which CVSS Base scoring assumes is enabled when assessing the vulnerable configuration.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>The known affected Temporal Server lower bound is 0.10.0, based on a source-confirmed built-in filestore visibility-archival query path; earlier Server releases are unknown. Additional source-confirmed SQL and Elasticsearch visibility paths begin in later releases. These routes do not require retained worker state. Their availability depends on the deployed visibility or archival configuration, which CVSS Base scoring assumes is enabled when assessing the vulnerable configuration.</p>"}]}, {"lang": "en", "value": "The dynamically confirmed Temporal Server ListWorkers route begins in 1.29.0. In 1.29.x, frontend.ListWorkersEnabled defaults to false; it defaults to true in 1.30.x. 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. The confirmed process-exit route also requires at least one retained worker heartbeat.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>The dynamically confirmed Temporal Server ListWorkers route begins in 1.29.0. In 1.29.x, frontend.ListWorkersEnabled defaults to false; it defaults to true in 1.30.x. 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. The confirmed process-exit route also requires at least one retained worker heartbeat.</p>"}]}], "workarounds": [{"lang": "en", "value": "Applications can impose a conservative query-size or nesting limit before parsing and avoid recursively formatting or walking parser-produced trees derived from untrusted input. Temporal Server 1.29 and 1.30 operators can disable ListWorkers when it is unused, disable unused archival reads, and restrict namespace read permission to trusted principals. Go panic recovery is not an effective mitigation for runtime-fatal stack overflow.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Applications can impose a conservative query-size or nesting limit before parsing and avoid recursively formatting or walking parser-produced trees derived from untrusted input. Temporal Server 1.29 and 1.30 operators can disable ListWorkers when it is unused, disable unused archival reads, and restrict namespace read permission to trusted principals. Go panic recovery is not an effective mitigation for runtime-fatal stack overflow.</p>"}]}], "solutions": [{"lang": "en", "value": "Upgrade github.com/temporalio/sqlparser to v0.0.0-20260721183058-0466b6b405ac or later; v0.0.0-20260722001706-17d16cfe1da5 is the preferred upgrade. 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 changes reject excessive nesting before recursive AST consumers receive an attacker-deep tree.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Upgrade github.com/temporalio/sqlparser to v0.0.0-20260721183058-0466b6b405ac or later; v0.0.0-20260722001706-17d16cfe1da5 is the preferred upgrade. 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 changes reject excessive nesting before recursive AST consumers receive an attacker-deep tree.</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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