URI Credential Leakage Bypass over CVE-2025-27221

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

• CISA KEV Not listed.
• EPSS 0.0056, the 46th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 31 Oct 2026, 15:16 UTC First seen by agentprime
2. 31 Oct 2026, 15:16 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-j4pr-3wm6-xx2r
• OSV: GHSA-j4pr-3wm6-xx2r
• github.com/ruby/uri/security/advisories/GHSA-j4pr-3wm6-xx2r
• nvd.nist.gov/vuln/detail/CVE-2025-61594
• github.com/ruby/uri/commit/20157e3e29b125ff41f1d9662e2e3b1d066f5902
• github.com/ruby/uri/commit/7e521b2da0833d964aab43019e735aea674e1c2c
• github.com/ruby/uri/commit/d3116ca66a3b1c97dc7577f9d2d6e353f391cd6a
• hackerone.com/reports/2957667
• github.com/advisories/GHSA-22h5-pq3x-2gf2
• github.com/ruby/uri
• github.com/rubysec/ruby-advisory-db/blob/master/gems/uri/CVE-2025-61594.yml
• www.ruby-lang.org/en/news/2025/02/26/security-advisories
• www.ruby-lang.org/en/news/2025/10/07/uri-cve-2025-61594

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.