CVE-2026-34219
MediumCVSS 5.9Exploitation Probability (EPSS)
Low risk32th percentile - higher than 32% of all known CVEs
Summary
In libp2p-rust before version 0.49.4, the Gossipsub implementation contains a remotely reachable panic in backoff expiry handling. After receiving a crafted PRUNE message with a near-maximum backoff value, the implementation performs unchecked time arithmetic, leading to overflow and panic.
Risk Assessment
An attacker can crash a Gossipsub node, causing denial of service (DoS) and potentially disrupting the libp2p network.
Recommendation
Update libp2p-rust to version 0.49.4 or later.
Original NVD description (English source)
libp2p-rust is the official rust language Implementation of the libp2p networking stack. Prior to version 0.49.4, the Rust libp2p Gossipsub implementation contains a remotely reachable panic in backoff expiry handling. After a peer sends a crafted PRUNE control message with an attacker-controlled, near-maximum backoff value, the value is accepted and stored as an Instant near the representable upper bound. On a later heartbeat, the implementation performs unchecked Instant + Duration arithmetic (backoff_time + slack), which can overflow and panic with: overflow when adding duration to instant. This issue is reachable from any Gossipsub peer over normal TCP + Noise + mplex/yamux connectivity and requires no further authentication beyond becoming a protocol peer. This issue has been patched in version 0.49.4.