CVE-2026-34063

Nimiq's network-libp2p is a Nimiq network implementation based on libp2p. Prior to version 1.3.0, `network-libp2p` discovery uses a libp2p `ConnectionHandler` state machine. the handler assumes there is at most one inbound and one outbound discovery substream per connection. if a remote peer opens/negotiate the discovery protocol substream a second time on the same connection, the handler hits a `panic!(\"Inbound already connected\")` / `panic!(\"Outbound already connected\")` path instead of failing closed. This causes a remote crash of the networking task (swarm), taking the node's p2p networking offline until restart. The patch for this vulnerability is formally released as part of v1.3.0. No known workarounds are available.

The following products are affected by CVE-2026-34063 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-34063.

URL	Resource
https://github.com/nimiq/core-rs-albatross/commit/e0d4e01994f061bf41d3c2835bc74040d3c084f5
https://github.com/nimiq/core-rs-albatross/pull/3666
https://github.com/nimiq/core-rs-albatross/releases/tag/v1.3.0
https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-74hp-mhfx-m45h