Vulnerability in nimiq-blockchain (CVE-2026-46369)
Summary
Vulnerability in nimiq-blockchain (CVE-2026-46369). Data can be tampered with by attackers. Mitigation: upgrade to 1.5.1 or later.
Original description
The description as published by the source.
Impact
The validity store treats a transaction with stored block_number = X as "in window" only when X > last_bn - transaction_validity_window_blocks (strict inequality). However the protocol's Transaction::is_valid_at accepts a transaction for inclusion in any block in [validity_start_height - blocks_per_batch, validity_start_height + window - 1]. By choosing validity_start_height = X + blocks_per_batch (the largest value still compatible with first inclusion at block X), an attacker can replay the same signed transaction in any block B such that X + window < B < validity_start_height + window, i.e., a contiguous window of blocks_per_batch - 1 blocks (59 on MainNet, ~10 minutes) during which the replay-protection check fails to flag it. The same transaction is then executed twice: the sender is debited twice, the recipient credited twice.
Patches
https://github.com/nimiq/core-rs-albatross/pull/3772
Workarounds
No known workarounds
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-46369 has been found in nimiq-blockchain.
Data can be tampered with by attackers. CVSS score: 7.5/10.
What to do: upgrade nimiq-blockchain to 1.5.1 or later.
If unsure, ask your IT team or search "nimiq-blockchain CVE-2026-46369" on the vendor's site.
CVE-2026-46369 (nimiq-blockchain) — CWE-193 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 1.5.1 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-193) exists in nimiq-blockchain.
Check the vendor advisory for the affected versions of nimiq-blockchain.
Severity: High (CVSS 7.5/10). Data can be tampered with by attackers.
Update to 1.5.1.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'nimiq-blockchain' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'nimiq-blockchain' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
nimiq-blockchainを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade nimiq-blockchain to 1.5.1ステージング環境で 1.5.1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- package github.com
- web github.com
- web github.com
- web github.com
- web github.com