CVE-2026-34219

CVE-2026-34219 affects libp2p-rust’s libp2p-gossipsub: prior to 0.49.4, Gossipsub’s backoff expiry handling can overflow when adding Slack to an Instant, after a crafted PRUNE with attacker-controlled backoff. This remotely reachable panic is triggered in heartbeat processing and is exploitable o...

CVE-2026-33040

The CVE concerns libp2p-rust Gossipsub: prior to version 0.49.3, the Gossipsub backoff handling accepts attacker-controlled PRUNE backoff values, enabling unchecked time arithmetic that can overflow when updating backoff state. A crafted PRUNE message with a very large backoff (e.g., u64::MAX) ca...