Vulnerability Description
nimiq-account contains account primitives to be used in Nimiq's Rust implementation. Prior to version 1.3.0, `VestingContract::can_change_balance` returns `AccountError::InsufficientFunds` when `new_balance < min_cap`, but it constructs the error using `balance: self.balance - min_cap`. `Coin::sub` panics on underflow, so if an attacker can reach a state where `min_cap > balance`, the node crashes while trying to return an error. The `min_cap > balance` precondition is attacker-reachable because the vesting contract creation data (32-byte format) allows encoding `total_amount` without validating `total_amount <= transaction.value` (the real contract balance). After creating such a vesting contract, the attacker can broadcast an outgoing transaction to trigger the panic during mempool admission and block processing. The patch for this vulnerability is included as part of v1.3.0. No known workarounds are available.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nimiq | Nimiq Proof-Of-Stake | < 1.3.0 |
Related Weaknesses (CWE)
References
- https://github.com/nimiq/core-rs-albatross/commit/4d01946f0b3d6c6e31786f91cdfb3ePatch
- https://github.com/nimiq/core-rs-albatross/pull/3658Issue TrackingPatch
- https://github.com/nimiq/core-rs-albatross/releases/tag/v1.3.0Release Notes
- https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-vc34-39q2-m6PatchVendor Advisory
FAQ
What is CVE-2026-34064?
CVE-2026-34064 is a vulnerability with a CVSS score of 5.3 (MEDIUM). nimiq-account contains account primitives to be used in Nimiq's Rust implementation. Prior to version 1.3.0, `VestingContract::can_change_balance` returns `AccountError::InsufficientFunds` when `new_b...
How severe is CVE-2026-34064?
CVE-2026-34064 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-34064?
Check the references section above for vendor advisories and patch information. Affected products include: Nimiq Nimiq Proof-Of-Stake.