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CVE-2026-65653— temporalio/tchannel-go zero-chunk call fragment 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 库未能正确拒绝包含校验和（checksum）元数据但缺少带长度前缀的参数字节块（length-prefixed argument chunks）的 TChannel 调用片段（call fragment）。当读取此类片段时，片段读取器（fragment reader）将内部维护的字节块切片（chunk slice）置为空，随后无条件地尝试访问该切片的第一个元素，从而引发越界访问。 攻击者（网络对端）可以构造并发送此类畸形调用片段，例如在标准初始化握

CVSS 8.7 · High EPSS 0.71% · P54

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
Temporal Technologies, Inc. temporalio/tchannel-go 0.0.0-20150531204735-8d8ca17342b3< 1.22.1-0.20260720194454-0cb017f6870a affected
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I. Basic Information for CVE-2026-65653

Vulnerability Information
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Vulnerability Title
temporalio/tchannel-go zero-chunk call fragment causes process termination
Source: CVE Program / CVE List V5
Vulnerability Description
github.com/temporalio/tchannel-go did not reject TChannel call fragments containing checksum metadata but no length-prefixed argument chunks. The fragment reader left its chunk slice empty and then unconditionally selected the first element. A network peer can supply such a malformed call fragment, including as a direct initial call request after completing the standard initialization handshake. On that inbound path, the resulting unrecovered Go slice-bounds panic occurs on a library-created dispatch goroutine and terminates 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 0.0.0-20150531204735-8d8ca17342b3 ~ 1.22.1-0.20260720194454-0cb017f6870a -

II. Public POCs for CVE-2026-65653

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III. Intelligence Information for CVE-2026-65653

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Patches & Fixes for CVE-2026-65653 (3)

Other References for CVE-2026-65653 (1)

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-2026-65654 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
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