Vulnerability · Published Sep 21, 2026 · Assigned by Temporal
CVE-2026-65654temporalio/ringpop-go fails to enforce configured label limits on inbound membership gossip
High 8.7
In plain English
A high-severity resource allocation without limits in temporalio/ringpop-go from Temporal Technologies, Inc.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities).
Official 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 products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Temporal Technologies, Inc. | temporalio/ringpop-go | 0.0.0-20160824133849-d0de5fe13330 – before 0.0.0-20260724173031-c317effcdc8b |
Weakness: CWE-770 · Vector: 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