{"id":"CVE-2026-95859","title":"libp2p-rust: Gossipsub GRAFT topics unbounded growth","summary":"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 confi…","severity":"high","cvss":8.7,"cvssVector":"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","cvssSource":"cna","cwe":["CWE-770"],"vendor":"libp2p","product":"rust-libp2p","affected":["rust-libp2p < 0.49.5"],"published":"2026-10-16","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:19:04.504Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-95859","references":[{"url":"https://github.com/libp2p/rust-libp2p/security/advisories/GHSA-g3g5-x568-qvqx","label":"https://github.com/libp2p/rust-libp2p/security/advisories/GHSA-g3g5-x568-qvqx"},{"url":"https://github.com/libp2p/rust-libp2p/pull/6608","label":"https://github.com/libp2p/rust-libp2p/pull/6608"},{"url":"https://github.com/libp2p/rust-libp2p/commit/51ed5f00e1b0620ded3444ecadf18477052148ea","label":"https://github.com/libp2p/rust-libp2p/commit/51ed5f00e1b0620ded3444ecadf18477052148ea"}],"tags":["cve.org"],"ingestedAt":"2026-10-16T17:24:46.653Z","slug":"CVE-2026-95859","body":"## Overview\n\nlibp2p-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.\n\n## Affected\n\n- `rust-libp2p < 0.49.5`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":47.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}