---
id: CVE-2026-65654
title: >-
  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
summary: >-
  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 pe…
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-770
vendor: 'Temporal Technologies, Inc.'
product: github.com/temporalio/ringpop-go
affected:
  - >-
    github.com/temporalio/ringpop-go >= 0.0.0-20160824133849-d0de5fe13330 <
    0.0.0-20260724173031-c317effcdc8b
published: '2026-09-21'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T19:40:05.870'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-65654'
references:
  - url: >-
      https://github.com/temporalio/ringpop-go/blob/b97329e994f792f70427a7533a3e7a98976eb262/swim/labels.go#L11-L61
    label: security@temporal.io
  - url: >-
      https://github.com/temporalio/ringpop-go/blob/b97329e994f792f70427a7533a3e7a98976eb262/swim/memberlist.go#L521-L612
    label: security@temporal.io
  - url: >-
      https://github.com/temporalio/ringpop-go/commit/c317effcdc8bc09ed1c11f00994782bda9685d4b
    label: security@temporal.io
  - url: >-
      https://github.com/temporalio/ringpop-go/commit/d0de5fe1333074d5c41a88e9053592e39f495bb2
    label: security@temporal.io
  - url: 'https://github.com/temporalio/ringpop-go/pull/22'
    label: security@temporal.io
  - url: 'https://github.com/temporalio/ringpop-go/tree/v0.1.0'
    label: security@temporal.io
tags:
  - nvd
  - cve.org
epss: 0.00577
epssPercentile: 0.452
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-21T15:26:15.984122Z'
cvssSource: cna
ingestedAt: '2026-09-21T12:36:35.288Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.