{"schemaVersion":3,"id":"CVE-2026-65653","aliases":[],"status":"published","duplicateOf":null,"title":null,"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.","dates":{"published":"2026-09-21T11:36:47.095Z","modified":"2026-09-21T15:28:21.825Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8.7,"severity":"high","version":"4.0","versionLabel":"v4.0","source":"CVE.org","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","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":8.7,"severity":"high","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","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":8.7,"severity":"high","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.0071,"percentile":0.52913,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-09-22T00:00:00.000Z","score":0.00679,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00679,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.0071,"percentile":0.52913}],"last30":[{"date":"2026-09-22T00:00:00.000Z","score":0.00679,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00679,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.0071,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.0071,"percentile":0.52913}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-129","name":"Improper Validation of Array Index","description":"The product uses untrusted input when calculating or using an array index, but the product does not validate or incorrectly validates the index to ensure the index references a valid position within the array.","type":"weakness","status":"Draft","abstraction":"Variant","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/129.html"}],"affected":[{"vendor":"temporal technologies, inc.","product":"temporalio/tchannel-go","name":"temporalio/tchannel-go","label":"temporalio/tchannel-go","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 0.0.0-20150531204735-8d8ca17342b3, < 1.22.1-0.20260720194454-0cb017f6870a","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 0.0.0-20150531204735-8d8ca17342b3, < 1.22.1-0.20260720194454-0cb017f6870a","eol":null,"hubHref":"/vendor/temporal_technologies_inc/temporaliotchannel-go"}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/temporalio/tchannel-go/commit/8d8ca17342b3620d3a6d5c1a825145595e7588ff","label":"github.com/temporalio/tchannel-go/commit/8d8ca17342b3620d3a6d5c1a825145595e7588ff","hostname":"github.com","tags":["Product"]},{"url":"https://github.com/temporalio/tchannel-go/blob/8706a1ab5f617efd79dace7ab2d1d80cc1881df0/fragmenting_reader.go#L256-L308","label":"github.com/temporalio/…","hostname":"github.com","tags":["Product"]},{"url":"https://github.com/temporalio/tchannel-go/commit/1dcfa67262ecd56a24f12940f4082549190cb5d1","label":"github.com/temporalio/tchannel-go/commit/1dcfa67262ecd56a24f12940f4082549190cb5d1","hostname":"github.com","tags":["Product"]},{"url":"https://github.com/temporalio/tchannel-go/pull/14","label":"github.com/temporalio/tchannel-go/pull/14","hostname":"github.com","tags":["Patch"]},{"url":"https://github.com/temporalio/tchannel-go/commit/0cb017f6870a8420695abeb9a4560d39dadc4e2e","label":"github.com/temporalio/tchannel-go/commit/0cb017f6870a8420695abeb9a4560d39dadc4e2e","hostname":"github.com","tags":["Patch"]},{"url":"https://github.com/temporalio/tchannel-go/tree/v1.22.1","label":"github.com/temporalio/tchannel-go/tree/v1.22.1","hostname":"github.com","tags":["Product"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-09-21T11:36:47.095Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-21T15:28:21.825Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":35,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T23:34:16.597Z","stale":false,"partial":false}}