# CVE-2026-65653: temporalio/tchannel-go zero-chunk call fragment causes process termination

> CVE-2026-65653: temporalio/tchannel-go zero-chunk call fragment causes process termination. CVSS 8.7 (CVSS 4.0).

Canonical: https://rewindex.com/cve/CVE-2026-65653
Last updated: 2026-09-22T19:40:05Z

- Published: 2026-09-21 11:36 UTC · Updated: 2026-09-22 19:40 UTC · Assigner: Temporal
- CVSS: 8.7 (CVSS 4.0) · Severity: High
- EPSS: 0.71%, 53th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-129

## 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.

## Affected vendors and products

- Temporal Technologies, Inc.: temporalio/tchannel-go

## Tracked companies

- [Temporal Cloud](https://rewindex.com/company/temporal-cloud.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-65653)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-65653)
- [https://github.com/temporalio/tchannel-go/blob/8706a1ab5f617efd79dace7ab2d1d80cc1881df0/fragmenting\_reader.go\#L256-L308](https://github.com/temporalio/tchannel-go/blob/8706a1ab5f617efd79dace7ab2d1d80cc1881df0/fragmenting_reader.go#L256-L308)
- [https://github.com/temporalio/tchannel-go/commit/0cb017f6870a8420695abeb9a4560d39dadc4e2e](https://github.com/temporalio/tchannel-go/commit/0cb017f6870a8420695abeb9a4560d39dadc4e2e)
- [https://github.com/temporalio/tchannel-go/commit/1dcfa67262ecd56a24f12940f4082549190cb5d1](https://github.com/temporalio/tchannel-go/commit/1dcfa67262ecd56a24f12940f4082549190cb5d1)
- [https://github.com/temporalio/tchannel-go/commit/8d8ca17342b3620d3a6d5c1a825145595e7588ff](https://github.com/temporalio/tchannel-go/commit/8d8ca17342b3620d3a6d5c1a825145595e7588ff)
- [https://github.com/temporalio/tchannel-go/pull/14](https://github.com/temporalio/tchannel-go/pull/14)
- [https://github.com/temporalio/tchannel-go/tree/v1.22.1](https://github.com/temporalio/tchannel-go/tree/v1.22.1)

---

_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


---
Canonical: https://rewindex.com/cve/CVE-2026-65653 · Markdown: https://rewindex.com/cve/CVE-2026-65653.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-65653 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T04:03:59.434Z