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CVE-2026-34219 is a remotely reachable denial-of-service vulnerability in the Rust libp2p Gossipsub implementation prior to version 0.49.4. The flaw is in backoff expiry handling for PRUNE control messages. A remote peer can send a crafted PRUNE message containing an attacker-controlled backoff value near the maximum representable duration. The implementation accepts this value and stores it as an Instant near the upper representable bound. During a subsequent heartbeat, the code performs unchecked time arithmetic by adding a slack Duration to the stored backoff Instant. If the stored value is sufficiently large, the addition overflows and triggers a panic. The issue is consistent with integer overflow in time calculations and results in a reachable assertion-style crash condition in normal protocol processing.
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A remotely triggerable panic in libp2p gossipsub used by Ethereum clients, caused by a Duration overflow in a PRUNE message.
A remotely reachable denial-of-service vulnerability in the Rust libp2p Gossipsub implementation where a crafted PRUNE control message can trigger unchecked Instant + Duration arithmetic overflow and panic the process.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.