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

Quick assessment

Affected
Temporal Technologies, Inc. temporalio/sqlparser
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 ap

CVSS 6.0 · Medium EPSS 0.64% · P49

Affected Version Matrix 5

VendorProduct Version RangeStatus
Temporal Technologies, Inc. Temporal Server 0.0.0< 0.10.0 unknown
0.10.0≤ 1.29.7 affected
1.30.0< 1.30.7 affected
1.31.0< 1.31.3 affected
Temporal Technologies, Inc. temporalio/sqlparser 0.0.0-20141206041240-1aae9baceee8< 0.0.0-20260721183058-0466b6b405ac affected
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I. Basic Information for CVE-2026-65651

Vulnerability Information

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Vulnerability Title
temporalio/sqlparser deeply nested unary expressions can cause a fatal stack overflow during AST traversal
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Temporal Technologies, Inc. temporalio/sqlparser 0.0.0-20141206041240-1aae9baceee8 ~ 0.0.0-20260721183058-0466b6b405ac -
Temporal Technologies, Inc. Temporal Server 0.10.0 ~ 1.29.7 cpe:2.3:a:temporal:temporal:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-65651

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III. Intelligence Information for CVE-2026-65651

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Patches & Fixes for CVE-2026-65651 (4)

Other References for CVE-2026-65651 (4)

Same Patch Batch · Temporal Technologies, Inc. · 2026-09-21 · 8 CVEs total

CVE-2026-89139 8.7 HIGH Temporal Server worker deployment compute provider executes a caller-supplied command on t
CVE-2026-65653 8.7 HIGH temporalio/tchannel-go zero-chunk call fragment causes process termination
CVE-2026-65654 8.7 HIGH temporalio/ringpop-go fails to enforce configured label limits on inbound membership gossi
CVE-2026-65652 8.7 HIGH temporalio/tchannel-go malformed checksum type causes process termination
CVE-2026-87858 7.2 HIGH Temporal Server completion callback source header can direct attacker-chosen requests to t
CVE-2026-16652 7.1 HIGH Temporal Server Schedule exclusion search can cause excessive CPU consumption
CVE-2026-16651 7.1 HIGH temporalio/sqlparser malformed MySQL version comments can cause a panic

IV. Related Vulnerabilities

Same product: temporalio/sqlparser
Same vendor: Temporal Technologies, Inc.
Same weakness: CWE-674

V. Comments for CVE-2026-65651

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