{"id":"GHSA-r33q-22hv-j29q","summary":"Denial of service in github.com/ethereum/go-ethereum","details":"### Impact\n\nA DoS vulnerability can make a LES server crash via malicious `GetProofsV2` request from a connected LES client.\n\n### Patches\n\nThe vulnerability was patched in https://github.com/ethereum/go-ethereum/pull/21896. \n\n### Workarounds\n\nThis vulnerability only concerns users explicitly enabling `les` server; disabling `les` prevents the exploit. \nIt can also be patched by manually applying the patch in https://github.com/ethereum/go-ethereum/pull/21896. \n\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [go-ethereum](https://github.com/ethereum/go-ethereum)\n* Email us at [security@ethereum.org](mailto:security@ethereum.org)","aliases":["CVE-2020-26264","GO-2021-0063"],"modified":"2026-05-07T05:02:24.866420260Z","published":"2021-06-29T21:14:07Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2021-05-21T21:45:23Z","nvd_published_at":null,"cwe_ids":["CWE-400"],"severity":"MODERATE"},"references":[{"type":"WEB","url":"https://github.com/ethereum/go-ethereum/security/advisories/GHSA-r33q-22hv-j29q"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-26264"},{"type":"WEB","url":"https://github.com/ethereum/go-ethereum/pull/21896"},{"type":"WEB","url":"https://github.com/ethereum/go-ethereum/commit/bddd103a9f0af27ef533f04e06ea429cf76b6d46"},{"type":"PACKAGE","url":"https://github.com/ethereum/go-ethereum"},{"type":"WEB","url":"https://github.com/ethereum/go-ethereum/releases/tag/v1.9.25"},{"type":"WEB","url":"https://pkg.go.dev/vuln/GO-2021-0063"}],"affected":[{"package":{"name":"github.com/ethereum/go-ethereum","ecosystem":"Go","purl":"pkg:golang/github.com/ethereum/go-ethereum"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.9.25"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/06/GHSA-r33q-22hv-j29q/GHSA-r33q-22hv-j29q.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}