Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 3.2 | Low | 3.1 | CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N | CNA (mitre) |
- CISA KEV Not listed.
- EPSS 0.0051, the 43rd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 15:16 UTC First seen by agentprime
- 31 Oct 2026, 15:16 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-22h5-pq3x-2gf2
- OSV: GHSA-22h5-pq3x-2gf2
- nvd.nist.gov/vuln/detail/CVE-2025-27221
- github.com/ruby/uri/pull/154
- github.com/ruby/uri/pull/155
- github.com/ruby/uri/pull/156
- github.com/ruby/uri/pull/157
- hackerone.com/reports/2957667
- github.com/ruby/uri
- github.com/rubysec/ruby-advisory-db/blob/master/gems/uri/CVE-2025-27221.yml
- lists.debian.org/debian-lts-announce/2025/03/msg00008.html
- lists.debian.org/debian-lts-announce/2025/05/msg00015.html
- www.cve.org/CVERecord?id=CVE-2025-27221
- www.ruby-lang.org/en/news/2025/02/26/security-advisories