What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-13 · updated 2026-10-26
• Weakness: CWE-125

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.

Affected products

• nimiq-transaction: before 1.3.0 — fixed in 1.3.0

How to fix

Upgrade to a fixed version: nimiq-transaction 1.3.0. Check the vendor advisory for mitigations.

References

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

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