Vulnerability in Ruby-Lang Uri
CVE-2025-27221
In the URI gem before 1.0.3 for Ruby, the URI handling methods (URI.join, URI#merge, URI#+) have an inadvertent leakage of authentication credentials because userinfo is retained even after changing the host.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.2 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (41.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000
Affected products
- Ruby-Lang Uri — versions 0, 0.12.0, 0.13.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- hackerone.com/reports/2957667 (Permissions Required)
- github.com/rubysec/ruby-advisory-db/blob/master/gems/uri/CVE-2025-27221.yml (Third Party Advisory)
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2025-27221?
- CVE-2025-27221 is a low-severity vulnerability in Ruby-Lang Uri, classified under Improper Removal of Sensitive Information Before Storage or Transfer. CVSS score: 3.2/10. Published 2025-03-04.
- How severe is CVE-2025-27221?
- Low severity. CVSS v3 base score is 3.2 out of 10.
- Is CVE-2025-27221 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.