# CVE-2026-65654: temporalio/ringpop-go fails to enforce configured label limits on inbound membership gossip

> CVE-2026-65654: temporalio/ringpop-go fails to enforce configured label limits on inbound membership gossip. CVSS 8.7 (CVSS 4.0).

Canonical: https://rewindex.com/cve/CVE-2026-65654
Last updated: 2026-09-22T19:40:05Z

- Published: 2026-09-21 11:38 UTC · Updated: 2026-09-22 19:40 UTC · Assigner: Temporal
- CVSS: 8.7 (CVSS 4.0) · Severity: High
- EPSS: 0.58%, 47th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-770

## Description

github.com/temporalio/ringpop-go enforces configured LabelOptions limits when an application changes the local node's labels, but affected versions do not apply those limits to label maps received in SWIM membership changes. A network peer that can reach a live Ringpop TChannel listener can repeatedly submit changes for distinct member addresses containing label keys, values, or counts that exceed the receiver's configured limits. Accepted labels are retained in the member list and disseminated to peers, allowing memory and gossip-bandwidth consumption to exceed configured bounds and potentially making the hosting process unavailable. The fix validates peer-supplied label maps before they are retained or disseminated. Availability only; no confidentiality or integrity impact was identified.

## Affected vendors and products

- Temporal Technologies, Inc.: temporalio/ringpop-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-2026-65654)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-65654)
- [https://github.com/temporalio/ringpop-go/blob/b97329e994f792f70427a7533a3e7a98976eb262/swim/labels.go\#L11-L61](https://github.com/temporalio/ringpop-go/blob/b97329e994f792f70427a7533a3e7a98976eb262/swim/labels.go#L11-L61)
- [https://github.com/temporalio/ringpop-go/blob/b97329e994f792f70427a7533a3e7a98976eb262/swim/memberlist.go\#L521-L612](https://github.com/temporalio/ringpop-go/blob/b97329e994f792f70427a7533a3e7a98976eb262/swim/memberlist.go#L521-L612)
- [https://github.com/temporalio/ringpop-go/commit/c317effcdc8bc09ed1c11f00994782bda9685d4b](https://github.com/temporalio/ringpop-go/commit/c317effcdc8bc09ed1c11f00994782bda9685d4b)
- [https://github.com/temporalio/ringpop-go/commit/d0de5fe1333074d5c41a88e9053592e39f495bb2](https://github.com/temporalio/ringpop-go/commit/d0de5fe1333074d5c41a88e9053592e39f495bb2)
- [https://github.com/temporalio/ringpop-go/pull/22](https://github.com/temporalio/ringpop-go/pull/22)
- [https://github.com/temporalio/ringpop-go/tree/v0.1.0](https://github.com/temporalio/ringpop-go/tree/v0.1.0)

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_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/)_


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Canonical: https://rewindex.com/cve/CVE-2026-65654 · Markdown: https://rewindex.com/cve/CVE-2026-65654.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-65654 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:10:43.807Z