{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-104420 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-104420 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-104420 is a medium-severity vulnerability in ZcashFoundation zebra, published on 2 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-104420 and fix it if it is affected.\n\nWhat it is: CVE-2026-104420 is a medium-severity vulnerability in ZcashFoundation zebra, published on 2 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-104420 in the wild and no public exploit code.\n\nAffected product: ZcashFoundation zebra. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-104420/ (Markdown: https://insights.sbomify.com/CVE-2026-104420/index.md)","id":"CVE-2026-104420","markdown":"https://insights.sbomify.com/CVE-2026-104420/index.md","name":"CVE-2026-104420","record":{"aliases":["GHSA-8hh2-hrf2-cqf4","GHSA-hfc4-gh7c-43q2"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Zcash node software","requires_auth":"none","summary":"Attackers can bypass peer misbehavior bans in Zebra by sending invalid gossiped blocks, enabling repeated resource-intensive verification attempts.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":6.9,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-704","name":"Incorrect Type Conversion or Cast"}],"description":"Zebra before 6.3.0 contains a protection mechanism failure that allows unauthenticated peers to evade misbehavior scoring by supplying invalid gossiped blocks. The inbound cleanup step wrongly downcasts RouterError to VerifyBlockError and discards the score, so attackers can repeatedly force block download and Equihash verification without being banned.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"Zebra before 6.3.0 Peer Misbehavior Ban Bypass via Gossiped Blocks","id":"CVE-2026-104420","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"security_feature_bypass","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"Zebra before 6.2.1 Block Download Denial of Service via KnownBlock SentHashes Lockout","id":"CVE-2026-104421"},"packages":[],"prev":{"headline":"Zebra before 6.3.0 Honest Peer Banning via Far-Ahead FindBlocks Hashes","id":"CVE-2026-104419"},"products":["zebra"],"published":"2026-10-02","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-06","vendors":["ZcashFoundation"]},"summary":"Attackers can bypass peer misbehavior bans in Zebra by sending invalid gossiped blocks, enabling repeated resource-intensive verification attempts.","url":"https://insights.sbomify.com/CVE-2026-104420/"}