CVE-2026-65654

temporalio/ringpop-go fails to enforce configured label limits on inbound membership gossip

State: Published
Severity: 8.7 High
Published: Sep 21, 2026
Updated: Sep 21, 2026
Reserved: Jul 22, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	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	Temporal

Weaknesses

CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

Product	Versions
temporalio/ringpop-goTemporal Technologies, Inc.	0.0.0-20160824133849-d0de5fe13330 to before 0.0.0-20260724173031-c317effcdc8bAffected

References

First affected source revisionproduct
Configured label limits and their resource-control purposeproduct
Vulnerable inbound membership-update pathproduct
Inbound label-validation fixpatch
First fixed default-branch revisionpatch
Fixed release tag v0.1.0product

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