---
id: CVE-2026-65652
title: >-
  github.com/temporalio/tchannel-go did not validate the one-byte checksum-type
  field in inbound TChannel call frames
summary: >-
  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…
severity: high
cvss: 8.7
cvssVector: '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'
cwe:
  - CWE-129
vendor: 'Temporal Technologies, Inc.'
product: github.com/temporalio/tchannel-go
affected:
  - >-
    github.com/temporalio/tchannel-go >= 0.0.0-20160105034737-a6904155f628 <
    1.22.1-0.20260720194454-0cb017f6870a
published: '2026-09-21'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T16:17:11.140'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-65652'
references:
  - url: >-
      https://github.com/temporalio/tchannel-go/blob/8706a1ab5f617efd79dace7ab2d1d80cc1881df0/checksum.go#L29-L93
    label: security@temporal.io
  - url: >-
      https://github.com/temporalio/tchannel-go/blob/8706a1ab5f617efd79dace7ab2d1d80cc1881df0/reqres.go#L280-L295
    label: security@temporal.io
  - url: >-
      https://github.com/temporalio/tchannel-go/commit/0cb017f6870a8420695abeb9a4560d39dadc4e2e
    label: security@temporal.io
  - url: >-
      https://github.com/temporalio/tchannel-go/commit/a6904155f628b9e602b7bc88ef489004a786f7f4
    label: security@temporal.io
  - url: 'https://github.com/temporalio/tchannel-go/pull/14'
    label: security@temporal.io
  - url: 'https://github.com/temporalio/tchannel-go/tree/v1.22.1'
    label: security@temporal.io
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-21T15:29:36.927700Z'
cvssSource: cna
ingestedAt: '2026-09-21T12:36:35.287Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.