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.
History

Mon, 21 Sep 2026 19:45:00 +0000

Type Values Removed Values Added
First Time appeared Temporal
Temporal tchannel-go
Vendors & Products Temporal
Temporal tchannel-go

Mon, 21 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 21 Sep 2026 11:45:00 +0000

Type Values Removed Values Added
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.
Title temporalio/tchannel-go zero-chunk call fragment causes process termination
Weaknesses CWE-129
References
Metrics cvssV4_0

{'score': 8.7, 'vector': '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Temporal

Published: 2026-09-21T11:36:47.095Z

Updated: 2026-09-21T15:28:21.825Z

Reserved: 2026-07-22T18:08:48.925Z

Link: CVE-2026-65653

cve-icon Vulnrichment

Updated: 2026-09-21T15:28:15.863Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-21T12:17:15.973

Modified: 2026-09-22T19:40:05.870

Link: CVE-2026-65653

cve-icon Redhat

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