CVE-2026-77384 libp2p: Circuit relay v2 server reservation refresh leaks abort listeners and allows remote resource exhaustion
Remote peers can cause denial of service in libp2p circuit relay servers by triggering unbounded memory growth through repeated reservation requests.
- 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-2026-77384?
CVE-2026-77384 is a high-severity denial of service vulnerability in js-libp2p, published on 24 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
libp2p is a JavaScript implementation of the libp2p networking stack. Prior to version 4.2.9, the reservation refresh path in reservation-store.ts reuses the same retimeableSignal but unconditionally registers another abort listener on every refresh. As a result, a remote peer can repeatedly send valid RESERVE requests for the same reservation, causing unbounded listener and closure growth in @libp2p/circuit-relay-v2 relay servers and leading to denial of service. This issue is fixed in version 4.2.9.
Which versions are affected by CVE-2026-77384?
How do I fix CVE-2026-77384?
No fix has been published for CVE-2026-77384 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-2026-77384 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-77384 exists.
Sources
Also known as GHSA-x787-gh7p-hmq7.