PatchTheCVECVE-2026-34063: Nimiq's network-libp2p is a Nimiq network implementation based on libp2p
CVE-2026-34063 is a high-severity flaw (CVSS 7.5) affecting nimiq proof-of-stake. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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!(\
Why this priority
- High severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.4% (top 71%) |
| CISA exploited list | No |
| Weakness | CWE-617 |
| Published | 2026-04-22 |
| Last modified | 2026-10-26 |
Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-34063?
nimiq proof-of-stake: upgrade to 1.3.0. Exact commands for each OS are on this page.
Is CVE-2026-34063 being exploited?
CVE-2026-34063 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-34063 affect?
CVE-2026-34063 affects nimiq proof-of-stake. Severity is high (CVSS 7.5). 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
How urgent is CVE-2026-34063?
Priority 38/100. High severity; Remotely exploitable, no login, no user action
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