# CVE-2026-34062: nimiq-libp2p is a Nimiq network implementation based on libp2p. Prior to version 1.3.0, `MessageCodec::read_request`…

Source: https://junglewise.ai/threats/cve-2026-34062-nimiq-libp2p-is-a-nimiq-network-implementation-based-on-libp2p  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-22  
License: CC BY 4.0 with a link back

CVE-2026-34062 · Severity: medium · CVSS 5.3 · Published 2026-04-22

nimiq-libp2p is a Nimiq network implementation based on libp2p. Prior to version 1.3.0, `MessageCodec::read_request` and `read_response` call `read_to_end()` on inbound substreams, so a remote peer can send only a partial frame and keep the substream open. because `Behaviour::new` also sets `with_max_concurrent_streams(1000)`, the node exposes a much larger stalled-slot budget than the library default. The patch for this vulnerability is formally released as part of v1.3.0. No known workarounds are available.

Technologies: [Nimiq Proof-Of-Stake](https://junglewise.ai/threats/technologies/nimiq-proof-of-stake). Vendors: [Nimiq](https://junglewise.ai/threats/vendors/nimiq).

## Quick answers

**Is CVE-2026-34062 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-34062 being exploited in the wild.

**How severe is CVE-2026-34062?** Medium severity, with a CVSS score of 5.3, published 22 April 2026.

**Which products and versions are affected?** Nimiq Proof-Of-Stake. The advisory does not name versions.

**Is there a fix for CVE-2026-34062?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2026-34062?** Check whether you run Nimiq Proof-Of-Stake. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Nimiq Proof-Of-Stake

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