CVE-2026-35405 libp2p-rendezvous: Unlimited namespace registrations per peer enables OOM DoS on rendezvous servers
A malicious peer can exhaust server memory by registering unlimited namespaces, causing an out-of-memory denial of service in libp2p rendezvous servers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-35405?
CVE-2026-35405 is a high-severity denial of service vulnerability in rust-libp2p, published on 7 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
libp2p-rust is the official rust language Implementation of the libp2p networking stack. Prior to 0.17.1, libp2p-rendezvous server has no limit on how many namespaces a single peer can register. A malicious peer can just keep registering unique namespaces in a loop and the server happily accepts every single one allocating memory for each registration with no pushback. Keep doing this long enough (or with multiple sybil peers) and the server process gets OOM killed. This vulnerability is fixed in 0.17.1.
Weakness: CWE-770
Which versions are affected by CVE-2026-35405?
2 open source packages ship an affected version, including libp2p-rendezvous. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
libp2p-rendezvous crates.io | All versions | 0.17.1 |
libp2p-rendezvous crates.io | All versions | 0.17.1 |
Products include Protocol Libp2p.
How do I fix CVE-2026-35405?
Upgrade libp2p-rendezvous to 0.17.1 or later.
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-2026-35405 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-35405 exists.
Other vulnerabilities in rust-libp2p
- CVE-2026-35457 libp2p-rust has unbounded rendezvous DISCOVER cookies enable remote memory exhaustion
- CVE-2023-40583 libp2p nodes vulnerable to OOM attack
- CVE-2022-23492 go-libp2p denial of service vulnerability from lack of resource management
- CVE-2022-23486 libp2p-rust denial of service vulnerability from lack of resource management
- CVE-2022-23487 libp2p denial of service vulnerability from lack of resource management
Sources
Also known as GHSA-cqfx-gf56-8x59.