{"schema":"threatline.record/2","record":{"id":"CVE-2026-104424","aliases":["GHSA-95m2-vx53-v2jw"],"summary":"Zebra before 6.1.0 Incorrect Block Size Calculation in getblocktemplate","details":"Zebra before 6.1.0 contains an incorrect calculation vulnerability in its ZIP-317 block template selector that omits header and transaction-count size from the block budget. Attackers can place valid selectable transactions in a victim miner's mempool to shape templates into oversized blocks, causing rejection and wasted proof-of-work.","categories":["Unclassified"],"product":"zebra","vendor":"ZcashFoundation","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-104424","source_modified_at":"2026-10-06T02:38:24.183Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"zebra","vendor":"ZcashFoundation","versions":[{"version":"0","status":"affected","versionType":"semver","lessThan":"6.1.0"},{"version":"6.1.0","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-104424","source_modified_at":"2026-10-06T02:38:24.183Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"zebra","ecosystem":null},"version":"6.1.0","basis":"first unaffected version stated in the CVE record"}],"cvss":6.3,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.00273,"percentile":0.18674,"score_date":"2026-10-23"},"published_at":"2026-10-02T11:38:05.827Z","modified_at":"2026-10-06T02:38:24.183Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-104424","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-10-06T02:38:24.183Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-104424","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-95m2-vx53-v2jw","tags":["vendor-advisory"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/zebra-before-6.1.0-incorrect-block-size-calculation-in-getblocktemplate","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"partial","assessed_at":"2026-10-06T02:38:13.781191Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-06T02:38:24.183Z","content_hash":"470684da44206b95d3e60c69a3ce22cd3d47264c352d62c1791f66ebb59d686f"}}