CVE-2025-47908
Denial of service via malicious preflight requests in github.com/rs/cors
- State
- Published
- Severity
- 7.5 High
- Published
- Aug 6, 2025
- Updated
- Aug 7, 2025
- Reserved
- May 13, 2025
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CISA-ADP |
Weaknesses
The record names no weakness.
Affected Products
| Product | Versions |
|---|---|
github.com/rs/corsgithub.com/rs/cors |
|
References
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