Vulnerability · Published Aug 26, 2026 · Assigned by GitHub_M

CVE-2026-46369Nimiq: Validity store off by one error

High 7.5

In plain English

A high-severity security flaw in core-rs-albatross from nimiq. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.5%top 53.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Nimiq is a Rust implementation of the Nimiq Proof-of-Stake protocol based on the Albatross consensus algorithm. Through 1.5.0, the validity store uses a strict lower-bound comparison that expires a stored transaction too early relative to Transaction::is_valid_at, allowing a remote attacker to replay the same signed transaction during a blocks_per_batch minus one block window and cause the sender and recipient balances to be updated twice. This issue is fixed in version 1.5.1.

Affected products (as reported)

Vendor	Product	Versions
nimiq	core-rs-albatross	< 1.5.1

Weakness: CWE-193, CWE-294 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References

https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-3763-qp59-59vf x_refsource_CONFIRM
https://github.com/nimiq/core-rs-albatross/pull/3772 x_refsource_MISC
https://github.com/nimiq/core-rs-albatross/commit/a530b2434ebca6e3716f07c73079786fcc6f2e41 x_refsource_MISC