CVE-2026-95859: high-severity vulnerability in libp2p rust-libp2p
libp2p-rust: Gossipsub GRAFT topics unbounded growth
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.7epss 0.3%
libp2p-rust is the official Rust language implementation of the libp2p networking stack. Prior to 0.49.5, Gossipsub GRAFT control-message handling unconditionally adds attacker-supplied topic hashes to connected_peer.topics without confirming that the peer previously subscribed to those topics. A remote unauthenticated peer that can reach a Gossipsub listener can repeatedly send novel GRAFT topics, causing cumulative per-peer memory growth that is not bounded by subscription filters, peer scoring, or per-message size limits. This can exhaust process memory and cause a denial of service. This issue is fixed in version 0.49.5.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
libp2p · rust-libp2pRelated CVEs — libp2p rust-libp2p
In the same product, most dangerous first.
CVE-2022-23486HIGHlibp2p-rust denial of service vulnerability from lack of resource managementEPSS 0.7%CVE-2026-33040HIGHlibp2p-rust: Gossipsub PRUNE.backoff Duration OverflowEPSS 0.6%CVE-2026-34219HIGHlibp2p-gossipsub: Gossipsub PRUNE Backoff Heartbeat Instant OverflowEPSS 0.6%CVE-2026-35405HIGHlibp2p-rendezvous: Unlimited namespace registrations per peer enables OOM DoS on rendezvous serversEPSS 0.4%CVE-2026-35457HIGHlibp2p-rust has unbounded rendezvous DISCOVER cookies enable remote memory exhaustionEPSS 0.3%CVE-2026-61544HIGHlibp2p-quic: Remote panic via certificate expiry race during QUIC handshakeEPSS 0.3%