{"id":"CVE-2026-104436","published":"2026-10-02T12:17:14.210","lastModified":"2026-10-02T17:59:09.430","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.","cvssScore":3.7,"cvssSeverity":"LOW","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","cwes":["CWE-770"],"vendors":[],"products":[],"references":[{"url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-443g-gwgp-49x4","tags":[]},{"url":"https://www.vulncheck.com/advisories/zebra-before-4.5.0-cpu-amplification-via-uncapped-getblocks-getheaders-locator-length","tags":[]}],"exploitRefs":[{"url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-443g-gwgp-49x4","tags":[]}],"hasPoc":true,"ai":null}