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.
History

Thu, 22 Oct 2026 06:30:00 +0000

Type Values Removed Values Added
Title Uncontrolled Resource Consumption in Roundcube Webmail CSS Proxy Leading to Server Memory Exhaustion

Thu, 22 Oct 2026 02:45:00 +0000

Type Values Removed Values Added
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.
First Time appeared Roundcube
Roundcube webmail
Weaknesses CWE-770
CPEs cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*
Vendors & Products Roundcube
Roundcube webmail
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}


cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2026-10-22T02:12:34.577Z

Updated: 2026-10-22T02:12:34.577Z

Reserved: 2026-10-22T02:12:34.183Z

Link: CVE-2026-114731

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-22T03:16:38.363

Modified: 2026-10-22T16:45:49.550

Link: CVE-2026-114731

cve-icon Redhat

No data.