{"cve":"CVE-2026-33040","nvd":{"published":"2026-03-20T06:16:12.330","modified":"2026-06-17T10:36:51.167","status":"Analyzed","description":"libp2p-rust is the official rust language Implementation of the libp2p networking stack. In versions prior to 0.49.3, the Gossipsub implementation accepts attacker-controlled PRUNE backoff values and may perform unchecked time arithmetic when storing backoff state. A specially crafted PRUNE control message with an extremely large backoff (e.g. u64::MAX) can lead to Duration/Instant overflow during backoff update logic, triggering a panic in the networking state machine. This is remotely reachable over a normal libp2p connection and does not require authentication. Any application exposing a libp2p Gossipsub listener and using the affected backoff-handling path can be crashed by a network attacker that can reach the service port. The attack can be repeated by reconnecting and replaying the crafted control message. This issue has been fixed in version 0.49.3.","cvss_v4":{"vector":"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","score":8.7},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-190"],"references":["https://github.com/libp2p/rust-libp2p/security/advisories/GHSA-gc42-3jg7-rxr2"],"products":["protocol:libp2p-gossipsub"],"source":"nvd","synced_at":"2026-10-19T22:26:19.218427112+00:00"},"epss":{"cve":"CVE-2026-33040","score":0.00589,"percentile":0.48164,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-gc42-3jg7-rxr2","url":"https://osv.dev/vulnerability/GHSA-gc42-3jg7-rxr2","summary":"Gossipsub PRUNE.backoff Duration Overflow","modified":"2026-03-20T21:34:48.742824Z","packages":[{"ecosystem":"crates.io","name":"libp2p-gossipsub","purl":"pkg:cargo/libp2p-gossipsub","ranges":["<0.49.3"],"fixed":["0.49.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}