CVE-2026-35405: libp2p-rendezvous: Unlimited namespace registrations per peer enables OOM DoS on rendezvous servers

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-04-07 · updated 2026-06-17
Weakness: CWE-770

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.

Affected products

libp2p js-libp2p: before 0.17.1 — fixed in 0.17.1

How to fix

Upgrade to a fixed version: libp2p js-libp2p 0.17.1. Check the vendor advisory for mitigations.

References

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