{"id":"CVE-2026-123555","published":"2026-11-08T02:16:47.313","lastModified":"2026-11-08T02:16:47.443","description":"Zebra from 2.3.0 before 7.0.0 contains a denial of service vulnerability that allows unauthenticated peers to evade misbehavior scoring by sending transactions or blocks with invalid transparent scripts. Attackers can flood mempool with script-failing transactions or serve forged v5 block bodies with altered scriptSig bytes to exhaust CPU and repeatedly stall block sync.","cvssScore":7.5,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwes":["CWE-755"],"vendors":[],"products":[],"references":[{"url":"https://github.com/ZcashFoundation/zebra/commit/e8db87eb69254e0d4eedd058eadd48bdfa09065a","tags":[]},{"url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-jq45-ghw5-v37x","tags":[]},{"url":"https://www.vulncheck.com/advisories/zebra-2.3.0-before-7.0.0-denial-of-service-via-unscored-script-verification-failures","tags":[]}],"exploitRefs":[{"url":"https://github.com/ZcashFoundation/zebra/commit/e8db87eb69254e0d4eedd058eadd48bdfa09065a","tags":[]},{"url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-jq45-ghw5-v37x","tags":[]}],"hasPoc":true,"ai":null}