CVE-2025-27221
CVE-2025-27221 is a low-severity vulnerability in Ruby-lang Uri with a CVSS 3.x base score of 3.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-212.
Key facts
- Severity: Low (CVSS 3.x base score 3.2)
- EPSS exploit prediction: 0% (38th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-5508
- Weakness: CWE-212
- Affected product: Ruby-lang Uri
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is 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.
- How severe is CVE-2025-27221?
- CVE-2025-27221 has a CVSS 3.x base score of 3.2, rated low severity. It is exploitable over local access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
- Is CVE-2025-27221 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2025-27221?
- CVE-2025-27221 affects Ruby-lang Uri. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2025-27221?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2025-27221 have an EU (EUVD) identifier?
- Yes. CVE-2025-27221 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-5508.
- When was CVE-2025-27221 published?
- CVE-2025-27221 was published on 2025-03-04 and last updated on 2026-06-17.
References
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/uri/CVE-2025-27221.yml
- https://hackerone.com/reports/2957667
- https://lists.debian.org/debian-lts-announce/2025/03/msg00008.html
- https://lists.debian.org/debian-lts-announce/2025/05/msg00015.html
Affected products (1)
- cpe:2.3:a:ruby-lang:uri:*:*:*:*:*:ruby:*:*
More vulnerabilities in Ruby-lang Uri
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- CVE-2023-28755 — Medium (CVSS 5.3): A ReDoS issue was discovered in the URI component through 0.12.0 in Ruby through 3.2.1. The URI parser mishandles…
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