Vulnerability in Nimiq Network-Libp2p
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (28.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 28.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.004 · change: -0.003
Affected products
- Nimiq Network-Libp2p — versions < 1.3.0
- Nimiq Proof-Of-Stake
Weakness classification (CWE)
References
- github.com/nimiq/core-rs-albatross/security/advisories/GHSA-74hp-mhfx-m45h (Patch, Vendor Advisory)
- github.com/nimiq/core-rs-albatross/pull/3666 (Patch, Issue Tracking)
- github.com/nimiq/core-rs-albatross/commit/e0d4e01994f061bf41d3c2835bc74040d3c08… (Patch)
- github.com/nimiq/core-rs-albatross/releases/tag/v1.3.0 (Release Notes)
Frequently asked questions
- What is CVE-2026-34063?
- CVE-2026-34063 is a high-severity vulnerability in Nimiq Network-Libp2p, classified under Reachable Assertion. CVSS score: 7.5/10. Published 2026-04-22.
- How severe is CVE-2026-34063?
- High severity. CVSS v3 base score is 7.5 out of 10.