CVE-2026-33471

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Source
https://cve.org/CVERecord?id=CVE-2026-33471
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33471.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-33471
Aliases
Published
2026-04-22T19:13:04.687Z
Modified
2026-07-08T08:12:49.202313587Z
Severity
  • 9.6 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H CVSS Calculator
Summary
nimiq-block has skip block quorum bypass via out-of-range BitSet indices & u16 truncation
Details

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) for slot lookup. Prior to version 1.3.0, if an attacker can get a SkipBlockProof verified where MultiSignature.signers contains out-of-range indices spaced by 65536, these indices inflate len() but collide onto the same in-range u16 slot during aggregation. This makes it possible for a malicious validator with far fewer than 2f+1 real signer slots to pass skip block proof verification by multiplying a single BLS signature by the same factor. The patch for this vulnerability is included as part of v1.3.0. No known workarounds are available.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33471.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-1284",
        "CWE-190",
        "CWE-20",
        "CWE-345"
    ]
}
References

Affected packages

Git / github.com/nimiq/core-rs-albatross

Affected ranges

Type
GIT
Repo
https://github.com/nimiq/core-rs-albatross
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
5bd15d9af710abeecdfb63d0a721dc883efb59c4
Fixed
d02059053181ed8ddad6b59a0adfd661ef5cd823
Database specific 
{
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ],
    "cpe": "cpe:2.3:a:nimiq:nimiq_proof-of-stake:*:*:*:*:*:rust:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.3.0"
        }
    ]
}

Affected versions

v0.*
v0.1.0
v0.1.0-rc.0
v0.1.0-rc.1
v0.1.0-rc.2
v0.1.0-rc.3
v0.10.0
v0.11.0
v0.11.1
v0.11.2
v0.11.3
v0.11.4
v0.11.5
v0.12.0
v0.12.1
v0.13.0
v0.13.1
v0.14.0
v0.15.0
v0.16.0
v0.16.1
v0.17.0
v0.18.0
v0.19.0
v0.2.0
v0.2.1
v0.2.2
v0.20.0
v0.20.1
v0.20.2
v0.20.3
v0.20.4
v0.20.5
v0.21.0
v0.21.1
v0.22.0
v0.22.1
v0.22.2
v0.22.3
v0.23.0
v0.24.0
v0.24.1
v0.24.2
v0.24.3
v0.24.4
v0.3.0
v0.3.1
v0.3.2
v0.3.3
v0.4.0
v0.4.1
v0.5.0
v0.5.1
v0.5.2
v0.5.3
v0.5.4
v0.6.0
v0.7.0
v0.8.0
v0.8.1
v0.8.2
v0.8.3
v0.9.0
v1.*
v1.0.0
v1.0.0-rc.0
v1.0.0-rc.1
v1.0.0-rc.2
v1.0.0-rc.3
v1.0.0-rc.4
v1.0.0-rc.5
v1.0.1
v1.0.2
v1.0.3
v1.0.4
v1.0.5
v1.0.6
v1.0.7
v1.0.8
v1.0.9
v1.1.0
v1.1.1
v1.2.0
v1.2.1
v1.2.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33471.json"