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CVE-2026-46369 — Vulnerability in nimiq-blockchain — CVE Details

HIGH

nimiq-blockchain: Validity store off by one error

Published August 12, 2026Updated August 12, 2026Source: osv

Summary

### 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

Advisory Timeline

  • First published August 12, 2026 (61 days ago).
  • Last revised August 12, 2026 — 0 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Cargo
Update nimiq-blockchain to 1.5.1 or later
cargo update -p nimiq-blockchain --precise 1.5.1

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: crates.io (1).

PackageEcosystemAffectedFixed In
nimiq-blockchain
crates.io
All versions1.5.1

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.5 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References

Frequently Asked Questions

What is CVE-2026-46369?
nimiq-blockchain: Validity store off by one error This vulnerability has been assigned a severity rating of HIGH (CVSS score: 7.5/10).
How do I check if my project is affected by CVE-2026-46369?
CVE-2026-46369 affects nimiq-blockchain. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-46369 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
7.5

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-3763-qp59-59vf

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