CVE-2026-34067 nimiq-transaction vulnerable to panic via `HistoryTreeProof` length mismatch
A malicious peer can crash the application by sending a malformed transaction proof, requiring an upgrade to the fixed library version.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-34067?
CVE-2026-34067 is a low-severity denial of service vulnerability in nimiq-transaction, published on 22 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
nimiq-transaction provides the transaction primitive to be used in Nimiq's Rust implementation. Prior to version 1.3.0, `HistoryTreeProof::verify` panics on a malformed proof where `history.len() != positions.len()` due to `assert_eq!(history.len(), positions.len())`. The proof object is derived from untrusted p2p responses (`ResponseTransactionsProof.proof`) and is therefore attacker-controlled at the network boundary until validated. A malicious peer could trigger a crash by returning a crafted inclusion proof with a length mismatch. The patch for this vulnerability is included as part of v1.3.0. No known workarounds are available.
Weakness: CWE-617
Which versions are affected by CVE-2026-34067?
2 open source packages ship an affected version, including nimiq-transaction. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
nimiq-transaction crates.io | All versions to 0.2.0 | None |
nimiq-transaction crates.io | All versions to 0.2.0 | None |
Products include Nimiq Nimiq Proof-of-Stake.
How do I fix CVE-2026-34067?
No fix has been published for CVE-2026-34067 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-2026-34067 being exploited?
There is no known exploitation of CVE-2026-34067 in the wild and no public exploit code.
Other vulnerabilities in nimiq-transaction
- 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-2026-32605 Nimiq: Remote crash via off-by-one signer bounds check in proposal buffer
Sources
Also known as GHSA-264v-m8fm-76jm.