Answer in brief
CVE-2026-65653 records a High severity (CVSS 8.7) vulnerability in temporalio/tchannel-go zero-chunk call fragment causes process termination. The current sources do not mark it as known exploited. The current feed maps Temporal Technologies, Inc./github.com/temporalio/tchannel-go (generic), Temporal Technologies, Inc./temporalio/tchannel-go (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Temporal Technologies, Inc./github.com/temporalio/tchannel-go (generic), Temporal Technologies, Inc./temporalio/tchannel-go (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Temporal Technologies, Inc./github.com/temporalio/tchannel-gogeneric | >=0.0.0-20150531204735-8d8ca17342b3 <1.22.1-0.20260720194454-0cb017f6870a | 1.22.1-0.20260720194454-0cb017f6870a |
| Temporal Technologies, Inc./temporalio/tchannel-gogeneric | >=0.0.0-20150531204735-8d8ca17342b3 <1.22.1-0.20260720194454-0cb017f6870a | 1.22.1-0.20260720194454-0cb017f6870a |
Published upstream
Sep 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 21, 2026
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.
Quoted source text, attributed separately from HOL analysis.