{"id":"CVE-2026-65653","title":"github.com/temporalio/tchannel-go did not reject TChannel call fragments containing checksum metadata but no length-prefixed argument chunks","summary":"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 elem…","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 >= 0.0.0-20150531204735-8d8ca17342b3 < 1.22.1-0.20260720194454-0cb017f6870a"],"published":"2026-09-21","updated":"2026-09-21","sourceUpdated":"2026-09-21T16:17:11.300","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-65653","references":[{"url":"https://github.com/temporalio/tchannel-go/blob/8706a1ab5f617efd79dace7ab2d1d80cc1881df0/fragmenting_reader.go#L256-L308","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/1dcfa67262ecd56a24f12940f4082549190cb5d1","label":"security@temporal.io"},{"url":"https://github.com/temporalio/tchannel-go/commit/8d8ca17342b3620d3a6d5c1a825145595e7588ff","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":"2026-09-21T15:28:04.791087Z"},"cvssSource":"cna","ingestedAt":"2026-09-21T12:36:35.288Z","slug":"CVE-2026-65653","body":"## Overview\n\ngithub.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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":47.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}