CVE-2026-35457 libp2p-rust has unbounded rendezvous DISCOVER cookies enable remote memory exhaustion

What is CVE-2026-35457?

CVE-2026-35457 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, the rendezvous server stores pagination cookies without bounds. An unauthenticated peer can repeatedly issue DISCOVER requests and force unbounded memory growth. This vulnerability is fixed in 0.17.1.

Weakness: CWE-770

Which versions are affected by CVE-2026-35457?

2 open source packages ship an affected version, including libp2p-rendezvous. It affects 1 product.

Products include Protocol Libp2p.

How do I fix CVE-2026-35457?

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-2026-35457 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-35457 exists.

Other vulnerabilities in rust-libp2p

• CVE-2026-35405 libp2p-rendezvous: Unlimited namespace registrations per peer enables OOM DoS on rendezvous servers High 7.5
• CVE-2023-40583 libp2p nodes vulnerable to OOM attack High 7.5
• CVE-2022-23492 go-libp2p denial of service vulnerability from lack of resource management High 7.5
• CVE-2022-23486 libp2p-rust denial of service vulnerability from lack of resource management High 7.5
• CVE-2022-23487 libp2p denial of service vulnerability from lack of resource management High 7.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-v5hw-cv9c-rpg7.