CVE-2019-14809
golang: malformed hosts in URLs leads to authorization bypass
Severity
ModerateRed Hat Product Security
CVSS 3.0
Review impact separately from score.
Published · August 13, 2019
Updated · June 28, 2026
Description
net/url in Go before 1.11.13 and 1.12.x before 1.12.8 mishandles malformed hosts in URLs, leading to an authorization bypass in some applications. This is related to a Host field with a suffix appearing in neither Hostname() nor Port(), and is related to a non-numeric port number. For example, an attacker can compose a crafted javascript:// URL that results in a hostname of google.com.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
This flaw has no mitigation for any affected golang package versions.
CVSS / CWE
CVSS 3.0 · 7.5CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE-939 · Improper Authorization in Handler for Custom URL Scheme