CVE-2026-34219
Severity CVSS v4.0:
HIGH
Type:
CWE-190
Integer Overflow or Wraparound
Publication date:
31/03/2026
Last modified:
01/05/2026
Description
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.
Impact
Base Score 4.0
8.20
Severity 4.0
HIGH
Base Score 3.x
5.90
Severity 3.x
MEDIUM
Vulnerable products and versions
| CPE | From | Up to |
|---|---|---|
| cpe:2.3:a:protocol:libp2p-gossipsub:*:*:*:*:*:rust:*:* | 0.49.4 (excluding) |
To consult the complete list of CPE names with products and versions, see this page