{"id":"GHSA-pw4v-gr34-2553","summary":"Sydent DoS (via resource exhaustion) due to improper input validation","details":"### Impact\n\nMissing input validation of some parameters on the endpoints used to confirm third-party identifiers could cause excessive use of disk space and memory leading to resource exhaustion.\n\n### Patches\n\nFixed by 3175fd3.\n\n### For more information\n\nIf you have any questions or comments about this advisory, email us at security@matrix.org.","aliases":["CVE-2021-29433","PYSEC-2021-24"],"modified":"2026-09-10T03:49:03.750308427Z","published":"2021-04-16T19:53:37Z","database_specific":{"nvd_published_at":"2021-04-15T18:15:00Z","cwe_ids":["CWE-20","CWE-400"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2021-04-15T18:45:07Z"},"references":[{"type":"WEB","url":"https://github.com/matrix-org/sydent/security/advisories/GHSA-pw4v-gr34-2553"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-29433"},{"type":"WEB","url":"https://github.com/matrix-org/sydent/commit/3175fd358ebc2c310eab7a3dbf296ce2bd54c1da"},{"type":"PACKAGE","url":"https://github.com/matrix-org/sydent"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/matrix-sydent/PYSEC-2021-24.yaml"},{"type":"WEB","url":"https://pypi.org/project/matrix-sydent"}],"affected":[{"package":{"name":"matrix-sydent","ecosystem":"PyPI","purl":"pkg:pypi/matrix-sydent"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.0"}]}],"versions":["2.0.0","2.0.1","2.1.0","2.2.0"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/04/GHSA-pw4v-gr34-2553/GHSA-pw4v-gr34-2553.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:L"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"}]}