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

Severity: high (CVSS 8.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% 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, 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.

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

https://github.com/libp2p/rust-libp2p/security/advisories/GHSA-v5hw-cv9c-rpg7

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