What’s Vulnerable › Vulnerabilities

CVE-2025-4673: Sensitive headers not cleared on cross-origin redirect in net/http

• Severity: medium (CVSS 6.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-06-11 · updated 2026-06-17

Description

Proxy-Authorization and Proxy-Authenticate headers persisted on cross-origin redirects potentially leaking sensitive information.

Affected products

• Go standard library net/http: before 1.23.10; from 1.24.0-0 before 1.24.4 — fixed in 1.23.10, 1.24.4

How to fix

Upgrade to a fixed version: Go standard library net/http 1.23.10, 1.24.4. Check the vendor advisory for mitigations.

References

• https://go.dev/cl/679257
• https://go.dev/issue/73816
• https://groups.google.com/g/golang-announce/c/ufZ8WpEsA3A
• https://pkg.go.dev/vuln/GO-2025-3751

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