{"cve":"CVE-2026-34068","nvd":{"published":"2026-04-22T21:17:08.197","modified":"2026-10-26T22:10:00.163","status":"Analyzed","description":"nimiq-transaction provides the transaction primitive to be used in Nimiq's Rust implementation. Prior to version 1.3.0, the staking contract accepts `UpdateValidator` transactions that set `new_voting_key=Some(...)` while omitting `new_proof_of_knowledge`. this skips the proof-of-knowledge requirement that is needed to prevent BLS rogue-key attacks when public keys are aggregated. Because tendermint macro block justification verification aggregates validator voting keys and verifies a single aggregated BLS signature against that aggregate public key, a rogue-key voting key in the validator set can allow an attacker to forge a quorum-looking justification while only producing a single signature. While the impact is critical, the exploitability is low: The voting keys are fixed for the epoch, so the attacker would need to know the next epoch validator set (chosen through VRF), which is unlikely. The patch for this vulnerability is included as part of v1.3.0. No known workarounds are available.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N","score":6.8},"cwes":["CWE-347"],"references":["https://github.com/nimiq/core-rs-albatross/commit/e7f0ab7d2115e17d6e5548ddc60f10df1a5d645f","https://github.com/nimiq/core-rs-albatross/pull/3654","https://github.com/nimiq/core-rs-albatross/releases/tag/v1.3.0","https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-pf4j-pf3w-95f9"],"products":["nimiq:nimiq_proof-of-stake"],"source":"nvd","synced_at":"2026-10-26T22:26:44.656832877+00:00"},"epss":{"cve":"CVE-2026-34068","score":0.00201,"percentile":0.09908,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-pf4j-pf3w-95f9","url":"https://osv.dev/vulnerability/GHSA-pf4j-pf3w-95f9","summary":"nimiq-transaction: UpdateValidator transactions allows voting key change without proof-of-knowledge","modified":"2026-05-05T16:09:54.224832Z","packages":[{"ecosystem":"crates.io","name":"nimiq-transaction","purl":"pkg:cargo/nimiq-transaction","ranges":["<=0.2.0"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}