CVE-2026-35405

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

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

libp2p · rust-libp2p

CVSS v3.1 GITHUB

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.49% chance of exploitation in the next 30 days, 41st percentile

Published

2026-04-07

Updated

2026-04-09

Proof-of-concept exploits (1)

• advisories/GHSA-cqfx-gf56-8x59

Security advisories

• libp2p/rust-libp2p/security/advisories/GHSA-cqfx-gf56-8x59

References

• CVE Record
• NVD entry