# CVE-2026-126349: Addressable display_uri can show misleading hosts containing bidi and invisible characters

Status: published. Published: 2026-11-12. Updated: 2026-11-12.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- sporkmonger / addressable: >= 2.0.0, < 2.9.1 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 3.1 (low); CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N; source: CNA: GitHub_M

- CVSS 3.1: 3.1 (low); CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N; source: NVD: security-advisories@github.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-176, CWE-451, CWE-1007

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/sporkmonger/addressable/security/advisories/GHSA-539f-xcgw-2gjg (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/sporkmonger/addressable/commit/60455d32bb59fda2585a0e1865a9fcb21e8e55b1 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/sporkmonger/addressable/releases/tag/addressable-2.9.1 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/sporkmonger/addressable/commit/60455d32bb59fda2585a0e1865a9fcb21e8e55b1 (security-advisories@github.com)

- https://github.com/sporkmonger/addressable/releases/tag/addressable-2.9.1 (security-advisories@github.com)

- https://github.com/sporkmonger/addressable/security/advisories/GHSA-539f-xcgw-2gjg (security-advisories@github.com)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-126349; retrieved 2026-11-12; source updated 2026-11-12

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-126349; retrieved 2026-11-13; source updated 2026-11-12

Revision: 3ec856f712757737190c4d5894c9ba7705b83c7c1c02e571d8fc3fbdb92b217f

Canonical: https://y2.dev/cve/CVE-2026-126349

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