How severe is CVE-2026-34062?

CVE-2026-34062 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-34062 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34062?

CVE-2026-34062 affects Nimiq Nimiq Proof-of-stake. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34062?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-34062 have an EU (EUVD) identifier?

Yes. CVE-2026-34062 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25056.

When was CVE-2026-34062 published?

CVE-2026-34062 was published on 2026-04-22 and last updated on 2026-06-17.

CVE-2026-34062

CVE-2026-34062 is a medium-severity vulnerability in Nimiq Nimiq Proof-of-stake with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-770.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-25056
Weakness: CWE-770
Affected product: Nimiq Nimiq Proof-of-stake
Published: 2026-04-22
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-34062?: 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.
How severe is CVE-2026-34062?: CVE-2026-34062 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-34062 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34062?: CVE-2026-34062 affects Nimiq Nimiq Proof-of-stake. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34062?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-34062 have an EU (EUVD) identifier?: Yes. CVE-2026-34062 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25056.
When was CVE-2026-34062 published?: CVE-2026-34062 was published on 2026-04-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nimiq:nimiq_proof-of-stake:*:*:*:*:*:rust:*:*

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