CVE-2026-32605 Nimiq: Remote crash via off-by-one signer bounds check in proposal buffer
An untrusted peer can crash a Nimiq validator by sending a proposal with an out-of-bounds signer index, causing a panic before signature verification.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-32605?
CVE-2026-32605 is a high-severity denial of service vulnerability in nimiq core-rs-albatross, published on 13 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-32605?
It affects 1 product.
Products include Nimiq Nimiq Proof-of-Stake.
How do I fix CVE-2026-32605?
No fix has been published for CVE-2026-32605 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-32605 being exploited?
There is no known exploitation of CVE-2026-32605 in the wild and no public exploit code.
Other vulnerabilities in nimiq core-rs-albatross
- CVE-2026-33471 nimiq-block has skip block quorum bypass via out-of-range BitSet indices & u16 truncation
- CVE-2026-40093 nimiq-blockchain is missing a wall-clock upper bound on block timestamps
- CVE-2026-34063 network-libp2p: Peer can crash the node by opening discovery protocol substream twice
- CVE-2026-34065 nimiq-primitives: Node crash due to missing interlink validation in election macro block proposals
- CVE-2026-33184 nimiq/core-rs-albatross: Discovery handshake limit could underflow and later provoke a deterministic overflow panic
Sources
Also known as GHSA-g99c-h7j7-rfhv.