# CVE-2026-114731: roundcube: Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by an uncontrolled resource consumption vulnerabil...

CVE-2026-114731 is fixed in roundcube on 1 platform, first by DEBIAN-CVE-2026-114731, released October 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-114731
- Priority: Routine
- CVSS: 5.3 (medium)
- EPSS: 0.0043
- 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 an uncontrolled resource consumption vulnerability in the CSS proxy (the utils/modcss action). The fetched stylesheet was read into memory in full, with no size limit and no read timeout, so a stylesheet URL referencing an attacker-controlled host could be used to exhaust server memory. Upstream fixed this in the commit “Add a size limit to the CSS proxy content processing”, which caps the response at 5 MB, reads it as a stream and applies a read timeout.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | roundcube Debian 13.5 (trixie) | 1.6.20+dfsg-0+deb13u1 | [DEBIAN-CVE-2026-114731](https://patchblox.com/security/data/fix/linux/debian-cve-2026-114731.md) | Oct 24, 2026 |
| Linux | roundcube Debian 14 | 1.6.20+dfsg-1 | [DEBIAN-CVE-2026-114731](https://patchblox.com/security/data/fix/linux/debian-cve-2026-114731.md) | Oct 24, 2026 |

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Data as of 2026-11-10T01:44:33Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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