CVE-2025-27221: Uri URI Allows For Userinfo Leakage Vulnerability
LOWCVE-2025-27221 is a LOW (CVSS 3.2) uri allows for userinfo leakage vulnerability (CWE-212: Improper Removal of Sensitive Information Before Storage or Transfer) affecting Uri libraries in the RubyGems ecosystem. The issue involves uri allows for userinfo leakage in uri#join, uri#merge, and uri#+. Remediation is available by upgrading affected packages to version 0.11.3, 0.12.4, 0.13.2, 1.0.3.
CVE-2025-27221 at a Glance
Security Impact
CVSS: 3.2
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N).
How to Fix CVE-2025-27221
To remediate this vulnerability, upgrade all affected Uri dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade uri to 0.11.3Upgrade uri to 0.12.4Upgrade uri to 0.13.2Upgrade uri to 1.0.3Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for uriHow to Check if You Are Affected
To determine whether your application is affected by CVE-2025-27221, inspect your project dependencies for Uri:
inspect dependencies for uriAnalyze the terminal output to locate any version of Uri in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.11.3), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-212: Improper Removal of Sensitive Information Before Storage or Transfer, where the product stores, transfers, or shares a resource that contains sensitive information, but it does not properly remove that information before the product makes the resource available to unauthorized actors. In Uri, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2025-27221 Affected Uri Versions
4 component(s)References
Frequently Asked Questions
What is CVE-2025-27221?
Which Uri versions are affected?
What version fixes CVE-2025-27221?
Is uri affected?
What is the CVSS score of CVE-2025-27221?
What CWE is associated with CVE-2025-27221?
How can I check RubyGems dependencies for CVE-2025-27221?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-22h5-pq3x-2gf2",
"modified" : "2025-11-04T00:32:21Z",
"published" : "2025-03-03T22:07:53Z",
"aliases" : [ "CVE-2025-27221" ],
"summary" : "URI allows for userinfo Leakage in URI#join, URI#merge, and URI#+",
"details" : "There is a possibility for userinfo leakage by in the uri gem.\nThis vulnerability has been assigned the CVE identifier CVE-2025-27221. We recommend upgrading the uri gem.\n\n## Details\n\nThe methods `URI#join`, `URI#merge`, and `URI#+` retained userinfo, such as `user:password`, even after the host is replaced. When generating a URL to a malicious host from a URL containing secret userinfo using these methods, and having someone access that URL, an unintended userinfo leak could occur.\n\nPlease update URI gem to version 0.11.3, 0.12.4, 0.13.2, 1.0.3 or later.\n\n## Affected versions\n\nuri gem versions < 0.11.3, 0.12.0 to 0.12.3, 0.13.0, 0.13.1 and 1.0.0 to 1.0.2.\n\n## Credits\n\nThanks to Tsubasa Irisawa (lambdasawa) for discovering this issue.\nAlso thanks to nobu for additional fixes of this vulnerability.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N"
}, {
"type" : "CVSS_V4",
"score" : "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "RubyGems",
"name" : "uri"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "0.11.3"
} ]
} ]
}, {
"package" : {
"ecosystem" : "RubyGems",
"name" : "uri"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0.12.0"
}, {
"fixed" : "0.12.4"
} ]
} ]
}, {
"package" : {
"ecosystem" : "RubyGems",
"name" : "uri"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0.13.0"
}, {
"fixed" : "0.13.2"
} ]
} ]
}, {
"package" : {
"ecosystem" : "RubyGems",
"name" : "uri"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "1.0.0"
}, {
"fixed" : "1.0.3"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-27221"
}, {
"type" : "WEB",
"url" : "https://github.com/ruby/uri/pull/154"
}, {
"type" : "WEB",
"url" : "https://github.com/ruby/uri/pull/155"
}, {
"type" : "WEB",
"url" : "https://github.com/ruby/uri/pull/156"
}, {
"type" : "WEB",
"url" : "https://github.com/ruby/uri/pull/157"
}, {
"type" : "WEB",
"url" : "https://hackerone.com/reports/2957667"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/ruby/uri"
}, {
"type" : "WEB",
"url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/uri/CVE-2025-27221.yml"
}, {
"type" : "WEB",
"url" : "https://lists.debian.org/debian-lts-announce/2025/03/msg00008.html"
}, {
"type" : "WEB",
"url" : "https://lists.debian.org/debian-lts-announce/2025/05/msg00015.html"
}, {
"type" : "WEB",
"url" : "https://www.cve.org/CVERecord?id=CVE-2025-27221"
}, {
"type" : "WEB",
"url" : "https://www.ruby-lang.org/en/news/2025/02/26/security-advisories"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-200", "CWE-212" ],
"severity" : "LOW",
"github_reviewed" : true,
"github_reviewed_at" : "2025-03-03T22:07:53Z",
"nvd_published_at" : "2025-03-04T00:15:31Z"
}
}