{"id":"GHSA-593f-38f6-jp5m","summary":"Inefficient Regular Expression Complexity in koa","details":"### Summary\nKoa uses an evil regex to parse the `X-Forwarded-Proto` and `X-Forwarded-Host` HTTP headers. This can be exploited to carry out a Denial-of-Service attack.\n\n### PoC\n\nComing soon.\n\n### Impact\nThis is a Regex Denial-of-Service attack and causes memory exhaustion. The regex should be improved and empty values should not be allowed.","aliases":["CVE-2025-25200"],"modified":"2025-02-12T19:27:07.225487Z","published":"2025-02-12T19:23:09Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2025-02-12T19:23:09Z","nvd_published_at":"2025-02-12T18:15:28Z","cwe_ids":["CWE-1333"],"severity":"CRITICAL"},"references":[{"type":"WEB","url":"https://github.com/koajs/koa/security/advisories/GHSA-593f-38f6-jp5m"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-25200"},{"type":"WEB","url":"https://github.com/koajs/koa/commit/5054af6e31ffd451a4151a1fe144cef6e5d0d83c"},{"type":"WEB","url":"https://github.com/koajs/koa/commit/5f294bb1c7c8d9c61904378d250439a321bffd32"},{"type":"WEB","url":"https://github.com/koajs/koa/commit/93fe903fc966635a991bcf890cfc3427d33a1a08"},{"type":"PACKAGE","url":"https://github.com/koajs/koa"},{"type":"WEB","url":"https://github.com/koajs/koa/releases/tag/2.15.4"}],"affected":[{"package":{"name":"koa","ecosystem":"npm","purl":"pkg:npm/koa"},"ranges":[{"type":"SEMVER","events":[{"introduced":"2.0.0"},{"fixed":"2.15.4"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/02/GHSA-593f-38f6-jp5m/GHSA-593f-38f6-jp5m.json"}},{"package":{"name":"koa","ecosystem":"npm","purl":"pkg:npm/koa"},"ranges":[{"type":"SEMVER","events":[{"introduced":"3.0.0-alpha.0"},{"fixed":"3.0.0-alpha.3"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/02/GHSA-593f-38f6-jp5m/GHSA-593f-38f6-jp5m.json"}},{"package":{"name":"koa","ecosystem":"npm","purl":"pkg:npm/koa"},"ranges":[{"type":"SEMVER","events":[{"introduced":"1.0.0"},{"fixed":"1.7.1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/02/GHSA-593f-38f6-jp5m/GHSA-593f-38f6-jp5m.json"}},{"package":{"name":"koa","ecosystem":"npm","purl":"pkg:npm/koa"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.21.2"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/02/GHSA-593f-38f6-jp5m/GHSA-593f-38f6-jp5m.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H"}]}