# CVE-2019-15237: roundcube: Roundcube Webmail through 1.3.9 mishandles Punycode xn-- domain names,leading to homograph attacks.

CVE-2019-15237 is fixed in 6 products on 1 platform, first by roundcube 1.5.0+dfsg.1-2, released February 9, 2021. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2019-15237
- Priority: Routine
- CVSS: n/a (Low)
- EPSS: 0.0103
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 19, 2019

## Description

Roundcube Webmail through 1.3.9 mishandles Punycode xn-- domain names,leading to homograph attacks.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | roundcube Ubuntu 18.04.6 LTS (bionic) | 1.3.6+dfsg.1-1ubuntu0.1~esm8 | [roundcube 1.3.6+dfsg.1-1ubuntu0.1~esm8](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-roundcube-1.3.6-dfsg.1-1ubuntu0.1-esm8.md) | Feb 10, 2026 |
| Linux | roundcube Ubuntu 20.04 LTS (focal) | 1.4.3+dfsg.1-1ubuntu0.1~esm8 | [roundcube 1.4.3+dfsg.1-1ubuntu0.1~esm8](https://patchblox.com/security/data/fix/linux/ubuntu-focal-roundcube-1.4.3-dfsg.1-1ubuntu0.1-esm8.md) | Feb 10, 2026 |
| Linux | roundcube Ubuntu 22.04.1 LTS (jammy) | 1.5.0+dfsg.1-2 | [roundcube 1.5.0+dfsg.1-2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-roundcube-1.5.0-dfsg.1-2.md) | Feb 9, 2021 |
| Linux | roundcube Ubuntu 24.10 (oracular) | 1.5.0+dfsg.1-2 | [roundcube 1.5.0+dfsg.1-2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-roundcube-1.5.0-dfsg.1-2.md) | Jan 16, 2026 |
| Linux | roundcube Ubuntu 25.04 (plucky) | 1.5.0+dfsg.1-2 | [roundcube 1.5.0+dfsg.1-2](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-roundcube-1.5.0-dfsg.1-2.md) | Jan 16, 2026 |
| Linux | roundcube-core Ubuntu 18.04.6 LTS (bionic) | 1.3.6+dfsg.1-1ubuntu0.1~esm8 | [roundcube-core 1.3.6+dfsg.1-1ubuntu0.1~esm8](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-roundcube-core-1.3.6-dfsg.1-1ubuntu0.1-esm8.md) | Feb 10, 2026 |
| Linux | roundcube-core Ubuntu 20.04 LTS (focal) | 1.4.3+dfsg.1-1ubuntu0.1~esm8 | [roundcube-core 1.4.3+dfsg.1-1ubuntu0.1~esm8](https://patchblox.com/security/data/fix/linux/ubuntu-focal-roundcube-core-1.4.3-dfsg.1-1ubuntu0.1-esm8.md) | Feb 10, 2026 |
| Linux | roundcube-core Ubuntu 22.04.1 LTS (jammy) | 1.5.0+dfsg.1-2 | [roundcube-core 1.5.0+dfsg.1-2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-roundcube-core-1.5.0-dfsg.1-2.md) | Feb 9, 2021 |
| Linux | roundcube-core Ubuntu 24.10 (oracular) | 1.5.0+dfsg.1-2 | [roundcube-core 1.5.0+dfsg.1-2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-roundcube-core-1.5.0-dfsg.1-2.md) | Jan 16, 2026 |
| Linux | roundcube-core Ubuntu 25.04 (plucky) | 1.5.0+dfsg.1-2 | [roundcube-core 1.5.0+dfsg.1-2](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-roundcube-core-1.5.0-dfsg.1-2.md) | Jan 16, 2026 |
| Linux | roundcube-mysql Ubuntu 18.04.6 LTS (bionic) | 1.3.6+dfsg.1-1ubuntu0.1~esm8 | [roundcube-mysql 1.3.6+dfsg.1-1ubuntu0.1~esm8](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-roundcube-mysql-1.3.6-dfsg.1-1ubuntu0.1-esm8.md) | Feb 10, 2026 |
| Linux | roundcube-mysql Ubuntu 20.04 LTS (focal) | 1.4.3+dfsg.1-1ubuntu0.1~esm8 | [roundcube-mysql 1.4.3+dfsg.1-1ubuntu0.1~esm8](https://patchblox.com/security/data/fix/linux/ubuntu-focal-roundcube-mysql-1.4.3-dfsg.1-1ubuntu0.1-esm8.md) | Feb 10, 2026 |
| Linux | roundcube-mysql Ubuntu 22.04.1 LTS (jammy) | 1.5.0+dfsg.1-2 | [roundcube-mysql 1.5.0+dfsg.1-2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-roundcube-mysql-1.5.0-dfsg.1-2.md) | Feb 9, 2021 |
| Linux | roundcube-mysql Ubuntu 24.10 (oracular) | 1.5.0+dfsg.1-2 | [roundcube-mysql 1.5.0+dfsg.1-2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-roundcube-mysql-1.5.0-dfsg.1-2.md) | Jan 16, 2026 |
| Linux | roundcube-mysql Ubuntu 25.04 (plucky) | 1.5.0+dfsg.1-2 | [roundcube-mysql 1.5.0+dfsg.1-2](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-roundcube-mysql-1.5.0-dfsg.1-2.md) | Jan 16, 2026 |
| Linux | roundcube-pgsql Ubuntu 18.04.6 LTS (bionic) | 1.3.6+dfsg.1-1ubuntu0.1~esm8 | [roundcube-pgsql 1.3.6+dfsg.1-1ubuntu0.1~esm8](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-roundcube-pgsql-1.3.6-dfsg.1-1ubuntu0.1-esm8.md) | Feb 10, 2026 |
| Linux | roundcube-pgsql Ubuntu 20.04 LTS (focal) | 1.4.3+dfsg.1-1ubuntu0.1~esm8 | [roundcube-pgsql 1.4.3+dfsg.1-1ubuntu0.1~esm8](https://patchblox.com/security/data/fix/linux/ubuntu-focal-roundcube-pgsql-1.4.3-dfsg.1-1ubuntu0.1-esm8.md) | Feb 10, 2026 |
| Linux | roundcube-pgsql Ubuntu 22.04.1 LTS (jammy) | 1.5.0+dfsg.1-2 | [roundcube-pgsql 1.5.0+dfsg.1-2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-roundcube-pgsql-1.5.0-dfsg.1-2.md) | Feb 9, 2021 |
| Linux | roundcube-pgsql Ubuntu 24.10 (oracular) | 1.5.0+dfsg.1-2 | [roundcube-pgsql 1.5.0+dfsg.1-2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-roundcube-pgsql-1.5.0-dfsg.1-2.md) | Jan 16, 2026 |
| Linux | roundcube-pgsql Ubuntu 25.04 (plucky) | 1.5.0+dfsg.1-2 | [roundcube-pgsql 1.5.0+dfsg.1-2](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-roundcube-pgsql-1.5.0-dfsg.1-2.md) | Jan 16, 2026 |
| Linux | roundcube-plugins Ubuntu 18.04.6 LTS (bionic) | 1.3.6+dfsg.1-1ubuntu0.1~esm8 | [roundcube-plugins 1.3.6+dfsg.1-1ubuntu0.1~esm8](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-roundcube-plugins-1.3.6-dfsg.1-1ubuntu0.1-esm8.md) | Feb 10, 2026 |
| Linux | roundcube-plugins Ubuntu 20.04 LTS (focal) | 1.4.3+dfsg.1-1ubuntu0.1~esm8 | [roundcube-plugins 1.4.3+dfsg.1-1ubuntu0.1~esm8](https://patchblox.com/security/data/fix/linux/ubuntu-focal-roundcube-plugins-1.4.3-dfsg.1-1ubuntu0.1-esm8.md) | Feb 10, 2026 |
| Linux | roundcube-plugins Ubuntu 22.04.1 LTS (jammy) | 1.5.0+dfsg.1-2 | [roundcube-plugins 1.5.0+dfsg.1-2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-roundcube-plugins-1.5.0-dfsg.1-2.md) | Feb 9, 2021 |
| Linux | roundcube-plugins Ubuntu 24.10 (oracular) | 1.5.0+dfsg.1-2 | [roundcube-plugins 1.5.0+dfsg.1-2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-roundcube-plugins-1.5.0-dfsg.1-2.md) | Jan 16, 2026 |
| Linux | roundcube-plugins Ubuntu 25.04 (plucky) | 1.5.0+dfsg.1-2 | [roundcube-plugins 1.5.0+dfsg.1-2](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-roundcube-plugins-1.5.0-dfsg.1-2.md) | Jan 16, 2026 |
| Linux | roundcube-sqlite3 Ubuntu 18.04.6 LTS (bionic) | 1.3.6+dfsg.1-1ubuntu0.1~esm8 | [roundcube-sqlite3 1.3.6+dfsg.1-1ubuntu0.1~esm8](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-roundcube-sqlite3-1.3.6-dfsg.1-1ubuntu0.1-esm8.md) | Feb 10, 2026 |
| Linux | roundcube-sqlite3 Ubuntu 20.04 LTS (focal) | 1.4.3+dfsg.1-1ubuntu0.1~esm8 | [roundcube-sqlite3 1.4.3+dfsg.1-1ubuntu0.1~esm8](https://patchblox.com/security/data/fix/linux/ubuntu-focal-roundcube-sqlite3-1.4.3-dfsg.1-1ubuntu0.1-esm8.md) | Feb 10, 2026 |
| Linux | roundcube-sqlite3 Ubuntu 22.04.1 LTS (jammy) | 1.5.0+dfsg.1-2 | [roundcube-sqlite3 1.5.0+dfsg.1-2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-roundcube-sqlite3-1.5.0-dfsg.1-2.md) | Feb 9, 2021 |
| Linux | roundcube-sqlite3 Ubuntu 24.10 (oracular) | 1.5.0+dfsg.1-2 | [roundcube-sqlite3 1.5.0+dfsg.1-2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-roundcube-sqlite3-1.5.0-dfsg.1-2.md) | Jan 16, 2026 |
| Linux | roundcube-sqlite3 Ubuntu 25.04 (plucky) | 1.5.0+dfsg.1-2 | [roundcube-sqlite3 1.5.0+dfsg.1-2](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-roundcube-sqlite3-1.5.0-dfsg.1-2.md) | Jan 16, 2026 |

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