# CVE-2026-114716: roundcube: Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a mail header injection vulnerability

CVE-2026-114716 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-114716, released October 24, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-114716
- Priority: High
- CVSS: 8.5 (high)
- EPSS: 0.0039
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 22, 2026

## Description

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a mail header injection vulnerability. rcmail_sendmail::extract_inline_images() used the media type taken from an inline image data URI without validating it, so a remote authenticated attacker could inject arbitrary MIME part headers into the outgoing message by placing CRLF sequences in that media type. Upstream fixed this in the commit “Fix mail header injection via media type in an inline image data URI”, which validates the media type with rcube_mime::is_mimetype_valid().

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | roundcube Debian 13.5 (trixie) | 1.6.20+dfsg-0+deb13u1 | [DEBIAN-CVE-2026-114716](https://patchblox.com/security/data/fix/linux/debian-cve-2026-114716.md) | Oct 24, 2026 |
| Linux | roundcube Debian 14 | 1.6.20+dfsg-1 | [DEBIAN-CVE-2026-114716](https://patchblox.com/security/data/fix/linux/debian-cve-2026-114716.md) | Oct 24, 2026 |
| Linux | roundcubemail Fedora 43 | 1.6.20-1.fc43 | [FEDORA-2026-DB7E033531](https://patchblox.com/security/data/fix/linux/fedora-2026-db7e033531.md) | Nov 7, 2026 |

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Data as of 2026-11-09T19:38:12Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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