sporkmonger Addressable up to 2.9.0 IDNA IDNA.to_unicode input validation

Summaryinfo

A vulnerability was found in sporkmonger Addressable up to 2.9.0. It has been rated as problematic. This impacts the function Addressable::IDNA.to_unicode of the component IDNA. This manipulation causes input validation. This vulnerability is registered as CVE-2026-126349. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic was found in sporkmonger Addressable up to 2.9.0. Affected by this vulnerability is the function Addressable::IDNA.to_unicode of the component IDNA. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect integrity. The summary by CVE is:

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, Addressable::IDNA.to_unicode can decode Punycode labels that contain bidirectional controls, zero-width characters, control characters, or other default-ignorable format characters. Addressable::URI#display_uri can consequently show a reordered or visually indistinguishable hostname even though host, normalized_host, and network connections use the original encoded hostname. The pure-Ruby backend accepts the full prohibited set, while the native libidn backend is affected from 2.5.2 for characters added after Unicode 3.2. This issue is fixed in version 2.9.1.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-126349 since 11/10/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 2.9.1 eliminates this vulnerability.

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Productinfo

Vendor

• sporkmonger

Name

• Addressable

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9.0

Website

• Product: https://github.com/sporkmonger/addressable/

CPE 2.3info

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CPE 2.2info

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