{"cve":"CVE-2026-104436","nvd":{"published":"2026-10-02T12:17:14.210","modified":"2026-10-02T17:59:09.430","status":"Deferred","description":"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.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","score":6.3},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","score":3.7},"cwes":["CWE-770"],"references":["https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-443g-gwgp-49x4","https://www.vulncheck.com/advisories/zebra-before-4.5.0-cpu-amplification-via-uncapped-getblocks-getheaders-locator-length"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:57:46.668721662+00:00"},"epss":{"cve":"CVE-2026-104436","score":0.00273,"percentile":0.19488,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-443g-gwgp-49x4","url":"https://osv.dev/vulnerability/GHSA-443g-gwgp-49x4","summary":"zebrad vulnerable to getblocks/getheaders locator CPU amplification via uncapped vector length","modified":"2026-10-03T03:56:03.280851902Z","packages":[{"ecosystem":"crates.io","name":"zebrad","purl":"pkg:cargo/zebrad","ranges":["<4.5.0"],"fixed":["4.5.0"]},{"ecosystem":"crates.io","name":"zebra-chain","purl":"pkg:cargo/zebra-chain","ranges":["<8.0.0"],"fixed":["8.0.0"]}]}],"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."]}