net/url in Go before 1.11.13 and 1.12.x before 1.12.8 mishandles malformed hosts in URLs…
Priority MEDIUM 53Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 3 fixed, 5 without a fix
Attack profile from CVSS 3.0 · NVD. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
EPSS 0.08359 94th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Red Hat: 1 advisoryRed Hat: 3 fixed, 5 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:golang:go:*:*:*:*:*:*:*:* | before 1.11.13; 1.12.0 to before 1.12.8 | Vulnerable | Go standard library |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Debian |
- cpe:2.3:a:golang:go:*:*:*:*:*:*:*:* Versions before 1.11.13; 1.12.0 to before 1.12.8 Vulnerable ·Go standard library
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
Remediation
Red Hat 1 advisory
- RHSA-2019:3433 Released 2019-11-05 · Red Hat rating Moderatego-toolset:rhel8 security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream (v. 8) go-toolset-1.12.8-1.module+el8.1.0+4089+be929cf8.aarch64::go-toolset:rhel8, go-toolset-1.12.8-1.module+el8.1.0+4089+be929cf8.ppc64le::go-toolset:rhel8, go-toolset-1.12.8-1.module+el8.1.0+4089+be929cf8.s390x::go-toolset:rhel8 +16
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Ceph Storage 2 | Affected | No fix planned: Will not fix |
| Red Hat Ceph Storage 3 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Will not fix |
| Red Hat OpenStack Platform 9 (Mitaka) Operational Tools | Affected | No fix planned: Out of support scope |
| Red Hat Storage 3 | Affected | No fix yet |
| Red Hat Developer Tools for Red Hat Enterprise Linux Server (v. 7) | Fixed | — |
| Red Hat Developer Tools for Red Hat Enterprise Linux Workstation (v. 7) | Fixed | — |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2019:3433 |
Timeline
- 2026-10-02 Threatist record created from CVE-2019-14809
- 2026-10-03 Alias added: GHSA-2xf8-4fv6-m993
References
Advisory 10
Sources
- CVE-2019-14809 · CVE Program
- CVE-2019-14809 · NVD
- FIRST EPSS
- GHSA-2xf8-4fv6-m993 · GitHub Advisory Database · CC BY 4.0
- CVE-2019-14809 · Red Hat security data · CC BY 4.0
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