CVE-2026-34063

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 72% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this week
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
27.7%
KEV
Not listed

Published

April 22, 2026

Last Modified

April 24, 2026

Advisory Details (4)

Auto-updated Jun 6, 2026
Patch available. Sources: github_commit, github_pr, github_release, github.
github Patch Available

Peer can crash the node by opening discovery protocol substream twice · Advisory · nimiq/core-rs-albatross · GitHub

https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-74hp-mhfx-m45h
github_release Patch Available

Mainnet 1.3.0

Patch available: nimiq/core-rs-albatross v1.3.0

https://github.com/nimiq/core-rs-albatross/releases/tag/v1.3.0
github_pr

Fix crash on duplicate discovery substream

Upstream fix in progress (PR #3666 · nimiq/core-rs-albatross, state=closed)

https://github.com/nimiq/core-rs-albatross/pull/3666
github_commit Patch Available

commit e0d4e01994f0 (nimiq/core-rs-albatross)

Patch available: nimiq/core-rs-albatross v1.3.0 (contains commit e0d4e01994f0)

https://github.com/nimiq/core-rs-albatross/commit/e0d4e01994f061bf41d3c2835bc74040d3c084f5

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 40× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-23 14:18 UTCEPSS rescore
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  73. 2026-05-20 11:22 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2026-34063?
CVE-2026-34063 is a high vulnerability published on April 22, 2026. 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…
When was CVE-2026-34063 disclosed?
CVE-2026-34063 was first published in the National Vulnerability Database on April 22, 2026, with the most recent update on April 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-34063 actively exploited?
CVE-2026-34063 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 27.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-34063?
CVE-2026-34063 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-34063?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34063, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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