{"id":"CVE-2026-104436","aliases":[],"cve":{"records":[{"id":"CVE-2026-104436","source":"VulnCheck","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-10-02T00:50:26.604Z","published":"2026-10-02T11:38:13.172Z","modified":"2026-10-29T21:15:28.872Z"}],"publishers":[{"name":"VulnCheck","role":"CNA","organizationId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","modified":"2026-10-29T21:15:28.872Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-02T14:51:28.130Z"}],"references":[{"url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-443g-gwgp-49x4","tags":["vendor-advisory"],"source":"VulnCheck"},{"url":"https://www.vulncheck.com/advisories/zebra-before-4.5.0-cpu-amplification-via-uncapped-getblocks-getheaders-locator-length","tags":["third-party-advisory"],"source":"VulnCheck"}],"weaknesses":[{"id":"CWE-770","description":"Allocation of Resources Without Limits or Throttling","source":"VulnCheck"}],"applicability":[{"source":"VulnCheck","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:zfnd:zebra:*:*:*:*:*:*:*:*","versionEndExcluding":"4.5.0"},{"vulnerable":true,"criteria":"cpe:2.3:a:zfnd:zebra-chain:*:*:*:*:*:*:*:*","versionEndExcluding":"8.0.0"}]}]}]}],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-10-02T14:51:19.938453Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"no"},{"name":"Technical Impact","value":"partial"}]}]},"title":"Zebra before 4.5.0 CPU Amplification via Uncapped getblocks/getheaders Locator Length","titleSource":"VulnCheck","descriptionSource":"VulnCheck","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.","score":6.3,"severity":"medium","published":"2026-10-02T11:38:13.172Z","modified":"2026-10-29T21:15:28.872Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"ZcashFoundation","name":"zebra","platforms":[],"versions":[{"version":"0","status":"affected","lessThan":"4.5.0","versionType":"semver"},{"version":"4.5.0","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected","packageURL":"pkg:cargo/zebrad","packageIdentity":{"ecosystem":"crates.io","name":"zebrad"},"cpes":[],"source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-104436"},{"vendor":"ZcashFoundation","name":"zebra-chain","platforms":[],"versions":[{"version":"0","status":"affected","lessThan":"8.0.0","versionType":"semver"},{"version":"8.0.0","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected","packageURL":"pkg:cargo/zebra-chain","packageIdentity":{"ecosystem":"crates.io","name":"zebra-chain"},"cpes":[],"source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-104436"}],"remediation":[],"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"],"sources":[{"name":"CVE","id":"CVE-2026-104436","modified":"2026-10-29T21:15:28.872Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-104436"}],"assessments":[{"source":"VulnCheck","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},{"source":"VulnCheck","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","score":3.7}],"sourceAffected":[],"observedAt":"2026-10-29T21:39:35.016Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T00:40:33.739Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-10-30T00:25:35.327Z","attemptedAt":"2026-10-30T00:25:35.327Z"},{"source":"GHSA","status":"available","checkedAt":"2026-10-30T00:25:35.327Z","attemptedAt":"2026-10-30T00:25:35.327Z"},{"source":"EUVD","status":"available","checkedAt":"2026-10-30T00:25:35.603Z","attemptedAt":"2026-10-30T00:25:35.603Z"},{"source":"EPSS","status":"available","checkedAt":"2026-10-30T00:25:35.327Z","attemptedAt":"2026-10-30T00:25:35.327Z"}],"evidence":[{"source":"NVD","id":"CVE-2026-104436","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-104436","modified":"2026-10-29T21:17:08.690","score":6.3,"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","checkedAt":"2026-10-30T00:25:35.327Z"},{"source":"NVD","id":"CVE-2026-104436","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-104436","modified":"2026-10-29T21:17:08.690","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","checkedAt":"2026-10-30T00:25:35.327Z"},{"source":"FIRST EPSS","id":"CVE-2026-104436","url":"https://www.first.org/epss/","probability":0.00273,"percentile":0.19681,"date":"2026-10-29","checkedAt":"2026-10-30T00:25:35.327Z"},{"source":"GitHub Advisory Database","id":"GHSA-4m38-rccq-j8gv","url":"https://github.com/advisories/GHSA-4m38-rccq-j8gv","modified":"2026-10-02T12:31:21Z","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","checkedAt":"2026-10-30T00:25:35.327Z"},{"source":"ENISA EUVD","id":"EUVD-2026-91446","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-91446","modified":"Oct 29, 2026, 9:15:28 PM","score":6.3,"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","checkedAt":"2026-10-30T00:25:35.603Z"}],"aiSummary":{"text":"Zebra before 4.5.0 has a resource consumption vulnerability, allowing remote P2P peers to exhaust threads by sending oversized block locator vectors. Attackers can send getblocks or getheaders messages, degrading performance.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T09:34:51.781Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-104436"}]}}