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CVE-2026-65652— temporalio/tchannel-go malformed checksum type causes process termination

Quick assessment

Affected
Temporal Technologies, Inc. temporalio/tchannel-go
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.

github.com/temporalio/tchannel-go did not validate the one-byte checksum-type field in inbound TChannel call frames. A network peer that can reach a listener can complete the standard initialization handshake and send a call request with an unsupported checksu

CVSS 8.7 · High EPSS 0.52% · P43

Affected Version Matrix 1

VendorProduct Version RangeStatus
Temporal Technologies, Inc. temporalio/tchannel-go 0.0.0-20160105034737-a6904155f628< 1.22.1-0.20260720194454-0cb017f6870a affected
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I. Basic Information for CVE-2026-65652

Vulnerability Information

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Vulnerability Title
temporalio/tchannel-go malformed checksum type causes process termination
Source: CVE Program / CVE List V5
Vulnerability Description
github.com/temporalio/tchannel-go did not validate the one-byte checksum-type field in inbound TChannel call frames. A network peer that can reach a listener can complete the standard initialization handshake and send a call request with an unsupported checksum type. The parser uses that value as an index into a four-entry checksum pool, causing an unrecovered Go panic on the connection read goroutine and terminating the hosting process. This allows remote denial of service against applications that expose the listener to untrusted peers. The impact is limited to availability; no confidentiality or integrity impact was identified.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
对数组索引的验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Temporal Technologies, Inc. temporalio/tchannel-go 0.0.0-20160105034737-a6904155f628 ~ 1.22.1-0.20260720194454-0cb017f6870a -

II. Public POCs for CVE-2026-65652

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III. Intelligence Information for CVE-2026-65652

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Patches & Fixes for CVE-2026-65652 (3)

Other References for CVE-2026-65652 (3)

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-2026-87858 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
CVE-2026-65651 6.0 MEDIUM temporalio/sqlparser deeply nested unary expressions can cause a fatal stack overflow duri

IV. Related Vulnerabilities

Same product: temporalio/tchannel-go
Same vendor: Temporal Technologies, Inc.
Same weakness: CWE-129

V. Comments for CVE-2026-65652

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