CVE-2025-47908

Denial of service via malicious preflight requests in github.com/rs/cors

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.

7.5

CVSS

Severity: High

CVSS 3.1 •

EPSS 0.02%

Affected: github.com/rs/cors github.com/rs/cors

References

Link	Tags
https://github.com/rs/cors/pull/171
https://github.com/rs/cors/issues/170
https://pkg.go.dev/vuln/GO-2024-2883

Frequently Asked Questions

What is the severity of CVE-2025-47908?: CVE-2025-47908 has been scored as a high severity vulnerability.
How to fix CVE-2025-47908?: To fix CVE-2025-47908, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-47908 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-47908 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-47908?: CVE-2025-47908 affects github.com/rs/cors github.com/rs/cors.

This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.