What’s Vulnerable › Vulnerabilities

CVE-2025-47910: CrossOriginProtection insecure bypass patterns not limited to exact matches in net/http

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-22 · updated 2026-10-11

Description

When using http.CrossOriginProtection, the AddInsecureBypassPattern method can unexpectedly bypass more requests than intended. CrossOriginProtection then skips validation, but forwards the original request path, which may be served by a different handler without the intended security protections.

Affected products

• Go standard library net/http: from 1.25.0 before 1.25.1 — fixed in 1.25.1

How to fix

Upgrade to a fixed version: Go standard library net/http 1.25.1. Check the vendor advisory for mitigations.

References

• https://go.dev/cl/699275
• https://go.dev/issue/75054
• https://groups.google.com/g/golang-announce/c/PtW9VW21NPs/m/DJhMQ-m5AQAJ
• https://pkg.go.dev/vuln/GO-2025-3955

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