What is CVE-2026-33471?

CVE-2026-33471 is a critical-severity vulnerability in Nimiq Nimiq-block, classified under Improper Input Validation. CVSS score: 9.6/10. Published 2026-04-22.

How severe is CVE-2026-33471?

Critical severity. CVSS v3 base score is 9.6 out of 10.

Integer overflow in Nimiq Nimiq-block

CVE-2026-33471

nimiq-block contains block primitives to be used in Nimiq's Rust implementation. `SkipBlockProof::verify` computes its quorum check using `BitSet.len()`, then iterates `BitSet` indices and casts each `usize` index to `u16` (`slot as u16`)…

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.000 (10.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H.

Affected products

Nimiq Nimiq-block — versions < 1.3.0

Weakness classification (CWE)

References

https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-6973-8887-87ff (x_refsource_CONFIRM)
https://github.com/nimiq/core-rs-albatross/commit/d02059053181ed8ddad6b59a0adfd661ef5cd823 (x_refsource_MISC)
https://github.com/nimiq/core-rs-albatross/releases/tag/v1.3.0 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-33471?: CVE-2026-33471 is a critical-severity vulnerability in Nimiq Nimiq-block, classified under Improper Input Validation. CVSS score: 9.6/10. Published 2026-04-22.
How severe is CVE-2026-33471?: Critical severity. CVSS v3 base score is 9.6 out of 10.