Replay Attack Vulnerability in Nimiq Proof-of-Stake Protocol by Nimiq
CVE-2026-46369

7.5HIGH

Key Information:

Vendor

Nimiq

Status
Core-rs-albatross
Vendor
CVE Published:
26 August 2026

What is CVE-2026-46369?

A vulnerability in the Nimiq Proof-of-Stake protocol's validity store from version 1.5.0 allows remote attackers to exploit a timing issue. This occurs due to a strict lower-bound comparison that invalidates a stored transaction prematurely, enabling attackers to replay signed transactions within a narrow window. As a result, both sender and recipient balances can be manipulated, leading to double spending of transactions. This issue has been addressed in version 1.5.1.

Affected Version(s)

core-rs-albatross < 1.5.1

References

https://github.com/nimiq/core-rs-albatross/security/advis...
x_refsource_CONFIRM
https://github.com/nimiq/core-rs-albatross/pull/3772
x_refsource_MISC
https://github.com/nimiq/core-rs-albatross/commit/a530b24...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.