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CRITICAL

CVE-2019-14809

CVSS v3

9.8

CRITICAL

EPSS Score

8.4 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • stdlibGoall versions · fixed in 1.11.13

Vendor advisories

  • CVE-2019-14809 Red Hat Product Security59 products fixed · 22 known affected

    golang: malformed hosts in URLs leads to authorization bypass

    golang-bin as a component of Red Hat Ceph Storage 2 · golang-src as a component of Red Hat Ceph Storage 2 · golang.src as a component of Red Hat Ceph Storage 2

  • RHEA-2019:4179 Red Hat Product Security40 products fixed

    Red Hat Enhancement Advisory: new packages: go-toolset-1.12

  • RHSA-2019:3433 Red Hat Product Security19 products fixed

    Red Hat Security Advisory: go-toolset:rhel8 security, bug fix, and enhancement update

Full record on NVD

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.

Technical details

Published
2019-08-13

Frequently asked questions

What is CVE-2019-14809?

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.

Is CVE-2019-14809 actively exploited?

Active exploitation of CVE-2019-14809 has not been confirmed. Its EPSS score was 8.4% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-14809?

CVE-2019-14809 has a CVSS v3 base score of 9.8 (CRITICAL severity).

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