github.com
https://github.com/rs/cors CVE-2025-47908
HIGH
Denial of service via malicious preflight requests in github.com/rs/cors
Record summary
CVE-2025-47908 has a selected CVSS score of 7.5 (high).
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.
Description source: CVE List
Exploitation context
CISA SSVC decision
ExploitationPoC
AutomatableYes
Technical impactPartial
CISA Coordinator · SSVC 2.0.3 · Evaluated Aug 7, 2025 · Source: CVE List
Affected products and versions
2| Product | Source | Version range | Status |
|---|---|---|---|
github.com/rs/corsBrowse github.com/rs/cors / github.com/rs/corsDefault status: unaffected | CVE List | 1.9.0 to < 1.11.0 | affected |
github.com/rs/corsBrowse Go / github.com/rs/cors | GitHub Advisory | 1.9.0 to < 1.11.0 · Fixed in 1.11.0 | affected |
References
6github.com
https://github.com/rs/cors/commit/4c32059b2756926619f6bf70281b91be7b5dddb2 github.com
https://github.com/rs/cors/issues/170 github.com
https://github.com/rs/cors/pull/171 nvd.nist.gov
https://nvd.nist.gov/vuln/detail/CVE-2025-47908 pkg.go.dev
https://pkg.go.dev/vuln/GO-2024-2883