URI Credential Leakage Bypass over CVE-2025-27221

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• ruby-lang uribefore 0.12.5
• ruby-lang uri0.13.0 and later · before 0.13.3
• ruby-lang uri1.0.0 and later · before 1.0.4

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

• ruby uri

  • < 0.12.5, >= 0.13.0, < 0.13.3, >= 1.0.0, < 1.0.4affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Other highest-scoring records for the same primary product.

• CVE-2023-36617A ReDoS issue was discovered in the URI component before 0.12.2 for Ruby.
  22Monitor
• CVE-2023-28755A ReDoS issue was discovered in the URI component through 0.12.0 in Ruby through 3.2.1.
  22Monitor
• CVE-2025-27221In the URI gem before 1.0.3 for Ruby, the URI handling methods (URI.join, URI#merge, URI#+) have an inadvertent leakage of authentication cr
  21Monitor

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

The extension requests broader permissions than its function needs and sends the data it collects out for purposes beyond its stated function.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1{2  "permissions": ["tabs", "<all_urls>"],3  "background": { "service_worker": "analytics.js" }4}

1{2  "permissions": ["activeTab"],3  "host_permissions": ["https://yildiz.example/*"]4}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.