Hostname spoofing via backslashes in URL

Description

If using affected versions to determine a URL’s hostname, the hostname can be spoofed by using a backslash (\) character followed by an at (@) character. If the hostname is used in security decisions, the decision may be incorrect.

Recommendation

Update the urijs package to the latest compatible version. Followings are version details:

• Affected version(s): < 1.19.4
• Patched version(s): 1.19.4

References

• GHSA-3329-pjwv-fjpg
• www.npmjs.com
• CVE-2020-26291
• CWE-20
• CAPEC-310
• OWASP 2021-A3
• OWASP 2021-A6

Related Issues

• URIjs Vulnerable to Hostname spoofing via backslashes in URL - CVE-2021-3647
• URIjs Hostname spoofing via backslashes in URL - CVE-2021-27516
• Astro's middleware authentication checks based on url.pathname can be bypassed via url encoded values - CVE-2025-64765
• pdfmake is vulnerable to Throttling via repeatedly redirecting URL in file embedding - CVE-2025-11362

Tags:

npm

urijs