Security-control bypass via omitted empty userinfo
Published Feb 17, 2022 · Updated Dec 16, 2025
Incorrect URL parsing in Unshift.io url-parse before 1.5.7 allows remote attackers to bypass security decisions via crafted URLs. The toString routine omits an empty userinfo marker from special-scheme URLs with no host, converting an invalid input into a valid href whose pathname becomes the host. Exploitation requires a consuming application to authorize using hostname or origin and then request the reconstructed href, enabling access to a destination that the application intended to reject.
Summary
What happened
Incorrect URL parsing in Unshift.io url-parse before 1.5.7 allows remote attackers to bypass security decisions via crafted URLs. The toString routine omits an empty userinfo marker from special-scheme URLs with no host, converting an invalid input into a valid href whose pathname becomes the host. Exploitation requires a consuming application to authorize using hostname or origin and then request the reconstructed href, enabling access to a destination that the application intended to reject.
The record
- CVE
- CVE-2022-0639
- Published
- Feb 17, 2022
- Updated
- Dec 16, 2025
- Vendor
- Unshift.io
- Product
- url-parse
- Classifications
- CWE-639
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 17, 2022CVE publishedPublication date reported by the CVE source.
- Dec 16, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=unspecified <1.5.7
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Crafted empty-userinfo URL proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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