# CVE-2026-34062

> Vulnerability · severity: **MEDIUM** (CVSS 5.3).

## Description

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.

## Key facts

- **CVE ID:** CVE-2026-34062
- **Published:** 2026-04-22
- **CVSS severity:** MEDIUM
- **CVSS base score:** 5.3
- **CWE codes:** CWE-770

## Affected products

- `nimiq:nimiq_proof-of-stake`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-34062

## Citation

> AI Analytics. CVE-2026-34062. Retrieved 2026-07-23 from https://api.ai-analytics.org/cve/CVE-2026-34062. Derived from NIST NVD. Licensed CC0.

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