Vulnerability in Go Standard Library Net/http

CVE-2025-4673

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

EPSS: 0.006 (42.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N.

Affected products

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2025-4673?
CVE-2025-4673 is a medium-severity vulnerability in Go Standard Library Net/http, classified under CWE-201: INSERTION OF SENSITIVE INFORMATION INTO SENT DATA. CVSS score: 6.8/10. Published 2025-06-11.
How severe is CVE-2025-4673?
Medium severity. CVSS v3 base score is 6.8 out of 10.
Is CVE-2025-4673 known to be exploited?
4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.