Ethereum AI Security Agents Found Bug That Could Crash Any Node With a Single Message
A remotely-triggerable panic vulnerability in libp2p gossipsub allows any peer to crash Ethereum nodes with a single message. AI security agents discovered the bug, which is tracked as CVE-2026-34219. Upgrading is described as urgent.
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CVE-2026-34219, rated CVSS 8.2, let a crafted PRUNE message panic rust-libp2p gossipsub nodes below v0.49.4; Ethereum Foundation researchers surfaced it by running parallel AI agents over client code.
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