CVE-2019-14809
CVE-2019-14809 is a critical-severity vulnerability in Golang Go with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v2: 7.5
- EPSS exploit prediction: 8% (94th percentile)
- Actively exploited: Not listed in CISA KEV
- Affected product: Golang Go
- Published:
- Last modified:
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.
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.
- How severe is CVE-2019-14809?
- CVE-2019-14809 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2019-14809 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2019-14809?
- CVE-2019-14809 primarily affects Golang Go. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2019-14809?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2019-14809 published?
- CVE-2019-14809 was published on 2019-08-13 and last updated on 2026-06-17.
References
- 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
- 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
- https://github.com/golang/go/issues/29098
- https://groups.google.com/forum/#%21topic/golang-announce/0uuMm1BwpHE
- https://groups.google.com/forum/#%21topic/golang-announce/65QixT3tcmg
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4BBP27PZGSY6OP6D26E5FW4GZKBFHNU7/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LYO6E3H34C346D2E443GLXK7OK6KIYIQ/
- https://seclists.org/bugtraq/2019/Aug/31
- https://www.debian.org/security/2019/dsa-4503
Affected products (2)
- cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
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