CVE-2026-33471
SkipBlockProof bypass via out-of-range signer indices to pass verification.
Is CVE-2026-33471 being exploited?
Not confirmed. CVE-2026-33471 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.22% probability of exploitation in the next 30 days.
How severe is CVE-2026-33471?
CVE-2026-33471 is rated Critical with a CVSS score of 9.6. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-33471?
Yes. A fix has been recorded for CVE-2026-33471. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-33471 affect?
CVE-2026-33471 affects nimiq-block (Rust) SkipBlockProof, Nimiq blockchain client. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-33471?
Upgrade to v1.3.0+ immediately
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Forge skip block proofs with far fewer than 2f+1 real signers, risking consensus integrity.
Patch when possible
- affected< 1.3.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.