CVE-2026-34066: nimiq-blockchain provides persistent block storage for Nimiq's Rust implementation

Q: How do I fix CVE-2026-34066?

nimiq proof-of-stake: upgrade to 1.3.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-34066 being exploited?

CVE-2026-34066 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-34066 affect?

CVE-2026-34066 affects nimiq proof-of-stake. Severity is medium (CVSS 5.3). nimiq-blockchain provides persistent block storage for Nimiq's Rust implementation. Prior to version 1.3.0, `HistoryStore::put_historic_txns` uses an `assert!` to enforce invariants about `HistoricTransaction.block_number` (must be within t

Q: How urgent is CVE-2026-34066?

Priority 22/100. No elevated risk signals yet.

Routine

MEDIUM 5.3UPGRADE

CVE-2026-34066 is a medium-severity flaw (CVSS 5.3) affecting nimiq proof-of-stake. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

nimiq-blockchain provides persistent block storage for Nimiq's Rust implementation. Prior to version 1.3.0, `HistoryStore::put_historic_txns` uses an `assert!` to enforce invariants about `HistoricTransaction.block_number` (must be within the macro block being pushed and within the same epoch). During history sync, a peer can influence the `history: &[HistoricTransaction]` input passed into `Blockchain::push_history_sync`, and a malformed history

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-20, CWE-617, CWE-754
Published	2026-04-22
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: nimiq

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-22 20:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

nimiq nimiq proof-of-stake UPGRADE

Affected: < 1.3.0

Fixed in: 1.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy nimiq-proof-of-stake || rpm -q nimiq-proof-of-stake || nimiq-proof-of-stake --version

2. UPGRADE to 1.3.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade nimiq-proof-of-stake

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nimiq-proof-of-stake

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
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-2026-34066?

nimiq proof-of-stake: upgrade to 1.3.0. Exact commands for each OS are on this page.

Is CVE-2026-34066 being exploited?

CVE-2026-34066 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-2026-34066 affect?

CVE-2026-34066 affects nimiq proof-of-stake. Severity is medium (CVSS 5.3). nimiq-blockchain provides persistent block storage for Nimiq's Rust implementation. Prior to version 1.3.0, `HistoryStore::put_historic_txns` uses an `assert!` to enforce invariants about `HistoricTransaction.block_number` (must be within t

How urgent is CVE-2026-34066?

Priority 22/100. No elevated risk signals yet.

Related CVEs

CVE-2026-34065 HIGH 7.5 UPGRADE nimiq-primitives contains primitives (e.g., block, account, transaction) to be used in Nimiq's Rust implementa
CVE-2026-34063 HIGH 7.5 UPGRADE Nimiq's network-libp2p is a Nimiq network implementation based on libp2p
CVE-2026-34068 MEDIUM 6.8 UPGRADE nimiq-transaction provides the transaction primitive to be used in Nimiq's Rust implementation
CVE-2026-34067 LOW 3.1 UPGRADE nimiq-transaction provides the transaction primitive to be used in Nimiq's Rust implementation
CVE-2026-32605 HIGH 7.5 UPGRADE nimiq/core-rs-albatross is a Rust implementation of the Nimiq Proof-of-Stake protocol based on the Albatross c

References

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