{"id":"CVE-2025-47908","aliases":["GHSA-mh55-gqvf-xfwm","GO-2024-2883"],"url":"https://o3.security/vulnerability/CVE-2025-47908","summary":"Denial of service via malicious preflight requests in github.com/rs/cors","details":"Middleware causes a prohibitive amount of heap allocations when processing malicious preflight requests that include a Access-Control-Request-Headers (ACRH) header whose value contains many commas. This behavior can be abused by attackers to produce undue load on the middleware/server as an attempt to cause a denial of service.","published":"2025-08-06T20:41:31.311Z","modified":"2026-07-15T01:49:18.458053895Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/rs/cors","fixedVersion":"1.11.0"}],"fix":{"url":"https://github.com/rs/cors/pull/171","label":"rs/cors#171"},"references":[{"type":"WEB","url":"https://pkg.go.dev"},{"type":"WEB","url":"https://pkg.go.dev/vuln/GO-2024-2883"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/47xxx/CVE-2025-47908.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-47908"},{"type":"REPORT","url":"https://github.com/rs/cors/issues/170"},{"type":"FIX","url":"https://github.com/rs/cors/pull/171"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:49:18.458053895Z"}}