What is CVE-2026-35405?

CVE-2026-35405 is a high-severity vulnerability in Libp2p Rust-Libp2p, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-04-07.

How severe is CVE-2026-35405?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Libp2p Rust-Libp2p

CVE-2026-35405

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.

EPSS: 0.004 (32.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Libp2p Rust-libp2p — versions < 0.17.1
Protocol Libp2p

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-35405?: CVE-2026-35405 is a high-severity vulnerability in Libp2p Rust-Libp2p, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-04-07.
How severe is CVE-2026-35405?: High severity. CVSS v3 base score is 7.5 out of 10.