CVE-2026-65654 temporalio/ringpop-go fails to enforce configured label limits on inbound membership gossip
A remote attacker can exhaust memory and bandwidth by sending oversized label maps in SWIM gossip, causing denial of service in applications using ringpop-go.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-65654?
CVE-2026-65654 is a high-severity denial of service vulnerability in temporalio/ringpop-go, published on 21 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-770
Which versions are affected by CVE-2026-65654?
How do I fix CVE-2026-65654?
No fix has been published for CVE-2026-65654 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-65654 being exploited?
There is no known exploitation of CVE-2026-65654 in the wild and no public exploit code.
Sources
Also known as GHSA-2cw5-f255-55f8.