CVE-2026-34219

The record

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.

Affected packages

Related vulnerabilities

• GHSA-xqmp-fxgv-xvq5 libp2p-gossipsub: Remote crash via unchecked Instant overflow in heartbeat backoff expiry… Same vulnerability
• CVE-2026-33040 libp2p-rust is the official rust language Implementation of the libp2p networking stack. Also affects libp2p-gossipsub
• GHSA-gc42-3jg7-rxr2 Gossipsub PRUNE.backoff Duration Overflow Also affects libp2p-gossipsub
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