CVSS 3.1
4.3 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:NCVE-2026-126348
Addressable display_uri can show misleading hosts with invalid Punycode A-labels
Medium (4.3) in sporkmonger addressable.
On this page
Addressable is an alternative implementation to the URI implementation that is part of Ruby's standard library. From 2.0.0 until 2.9.1, the pure-Ruby Addressable::IDNA.to_unicode implementation decodes invalid Punycode A-labels instead of returning them unchanged. Labels that decode to ASCII text or fail to convert back to the same A-label can therefore make Addressable::URI#display_uri show a trusted-looking host while host, normalized_host, and the connection target retain the attacker-controlled encoded host. A trusted-name comparison using Addressable::IDNA.to_unicode output can also treat two different hosts as the same without displaying the URI. The native libidn implementation, to_ascii, and normalized_host are unaffected. This issue is fixed in version 2.9.1.
Severity
- CWEs
- CWE-20 Improper Input Validation
CWE-1007 Insufficient Visual Distinction of Homoglyphs Presented to User - OWASP Top 10
- A05:2025 Injection
- Published
- Assigned by
- GitHub_M (CNA)
- NVD analysis
- Awaiting analysis
- Record from
- the NVD, synced
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Affected
Versions
From the CNA's record in the CVE List.
| Product | Affected |
|---|---|
| sporkmonger addressable | >= 2.0.0, < 2.9.1 |
Attack patterns (CAPEC)
- CAPEC-632 Homograph Attack via Homoglyphs Likelihood: Low · Severity: Medium
The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits. More on the page of CWE-20 (51).