{"cve":"CVE-2025-47908","nvd":{"published":"2025-08-06T21:15:29.313","modified":"2026-06-17T09:28:49.670","status":"Deferred","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":[],"references":["https://github.com/rs/cors/issues/170","https://github.com/rs/cors/pull/171","https://pkg.go.dev/vuln/GO-2024-2883"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:06:45.861874017+00:00"},"epss":{"cve":"CVE-2025-47908","score":0.00631,"percentile":0.50272,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-mh55-gqvf-xfwm","url":"https://osv.dev/vulnerability/GHSA-mh55-gqvf-xfwm","summary":"Denial of service via malicious preflight requests in github.com/rs/cors","modified":"2026-09-10T03:50:16.858447726Z","packages":[{"ecosystem":"Go","name":"github.com/rs/cors","purl":"pkg:golang/github.com/rs/cors","ranges":[">=1.9.0 <1.11.0"],"fixed":["1.11.0"]}]},{"id":"GO-2024-2883","url":"https://osv.dev/vulnerability/GO-2024-2883","summary":"Denial of service via malicious preflight requests in github.com/rs/cors","modified":"2026-02-04T04:22:36.439584Z","packages":[{"ecosystem":"Go","name":"github.com/rs/cors","purl":"pkg:golang/github.com/rs/cors","ranges":[">=1.9.0 <1.11.0"],"fixed":["1.11.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}