{"schema":"threatline.record/2","record":{"id":"CVE-2026-104436","aliases":["GHSA-443g-gwgp-49x4"],"summary":"Zebra before 4.5.0 CPU Amplification via Uncapped getblocks/getheaders Locator Length","details":"Zebra before 4.5.0 contains an uncontrolled resource consumption vulnerability that allows remote P2P peers to exhaust blocking-pool threads by sending oversized block locator vectors. Attackers can send getblocks or getheaders messages with up to 65,535 locator hashes, triggering per-hash chain lookups that degrade block validation, RPC, and mempool performance.","categories":["Libraries & packages"],"product":"zebra","vendor":"ZcashFoundation","ecosystem":"crates.io","affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-104436","source_modified_at":"2026-10-02T14:51:28.130Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"zebra","vendor":"ZcashFoundation","versions":[{"lessThan":"4.5.0","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"4.5.0","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-104436","source_modified_at":"2026-10-02T14:51:28.130Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"zebra","vendor":"ZcashFoundation","versions":[{"lessThan":"8.0.0","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"8.0.0","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-443g-gwgp-49x4","source_modified_at":"2026-10-03T03:56:03.280851902Z","fetched_at":"2026-10-23T18:55:00.935475Z","package":{"name":"zebrad","ecosystem":"crates.io","purl":"pkg:cargo/zebrad"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"4.5.0"}]}],"versions":[]},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-443g-gwgp-49x4","source_modified_at":"2026-10-03T03:56:03.280851902Z","fetched_at":"2026-10-23T18:55:00.935475Z","package":{"name":"zebra-chain","ecosystem":"crates.io","purl":"pkg:cargo/zebra-chain"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"8.0.0"}]}],"versions":[]}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-104436","source_modified_at":"2026-10-02T14:51:28.130Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"zebra","ecosystem":null},"version":"4.5.0","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-104436","source_modified_at":"2026-10-02T14:51:28.130Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"zebra","ecosystem":null},"version":"8.0.0","basis":"first unaffected version stated in the CVE record"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-443g-gwgp-49x4","source_modified_at":"2026-10-03T03:56:03.280851902Z","fetched_at":"2026-10-23T18:55:00.935475Z","package":{"name":"zebrad","ecosystem":"crates.io","purl":"pkg:cargo/zebrad"},"version":"4.5.0"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-443g-gwgp-49x4","source_modified_at":"2026-10-03T03:56:03.280851902Z","fetched_at":"2026-10-23T18:55:00.935475Z","package":{"name":"zebra-chain","ecosystem":"crates.io","purl":"pkg:cargo/zebra-chain"},"version":"8.0.0"}],"cvss":6.3,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.00273,"percentile":0.18674,"score_date":"2026-10-23"},"published_at":"2026-10-02T11:38:13.172Z","modified_at":"2026-10-03T03:56:03.280851902Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-104436","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-10-02T14:51:28.130Z"},{"source":"OSV","url":"https://osv.dev/vulnerability/GHSA-443g-gwgp-49x4","fetched_at":"2026-10-23T18:55:00.935475Z","source_modified_at":"2026-10-03T03:56:03.280851902Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-104436","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","OSV","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-443g-gwgp-49x4","tags":["vendor-advisory"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/zebra-before-4.5.0-cpu-amplification-via-uncapped-getblocks-getheaders-locator-length","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":"2026-10-02T14:51:19.938453Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"ecosystem","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-03T03:56:03.280851902Z","content_hash":"7c801880edd92565804e4f010455a34fda2085e4865d370aff35297dacb57b93"}}