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

Severity: high (CVSS 8.7 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-21 · updated 2026-09-22
Weakness: 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 products

Temporal Technologies, Inc. temporalio/ringpop-go: from 0.0.0-20160824133849-d0de5fe13330 before 0.0.0-20260724173031-c317effcdc8b — fixed in 0.0.0-20260724173031-c317effcdc8b

How to fix

Upgrade to a fixed version: Temporal Technologies, Inc. temporalio/ringpop-go 0.0.0-20260724173031-c317effcdc8b. Check the vendor advisory for mitigations.

References

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