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Critical, CVSS 9.1

nimiq-blockchain is missing a wall-clock upper bound on block timestamps

CVE-2026-40093GHSA-49xc-52mp-cc9j

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • crates.io nimiq-blockchain

    Affected
    <= 1.3.0
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
9.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
EPSS
  • CVE-2026-40093: 0.31% estimated exploitation activity in the next 30 days; percentile 24.39 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Impact Block timestamp validation enforces that timestamp = parent.timestamp for non-skip blocks and timestamp == parent.timestamp + MINPRODUCERTIMEOUT for skip blocks, but there is no visible upper bound check against the wall clock. A malicious block-producing validator can set block timestamps arbitrarily far in the future. This directly affects reward calculations via Policy::supplyat() and batchdelay() in blockchain/src/reward.rs, inflating the monetary supply beyond the intended emission schedule. Patches TBD Workarounds No know workarounds.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-49xc-52mp-cc9j

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-40093

Advisory: nimiq-blockchain is missing a wall-clock upper bound on block timestamps
IDs: CVE-2026-40093, GHSA-49xc-52mp-cc9j
Record: https://patchnext.com/advisories/cve-2026-40093 (revision 1, source checked 26 Oct 2026, 15:42 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- crates.io nimiq-blockchain: affected <= 1.3.0

## Suggested inspection (read-only)
- crates.io nimiq-blockchain: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on nimiq-blockchain.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-49xc-52mp-cc9j (GitHub-reviewed advisory GHSA-49xc-52mp-cc9j lists affected ranges: crates.io nimiq-blockchain >=0 <=1.3.0)

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