CVE-2026-114731: CWE-770 Allocation of Resources Without Limits or Throttling in Roundcube Webmail
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.
CVSS v3.1
Score 5.3medium
Affected software
Roundcube
Webmail
pkg:github/WebmailRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-10-22T02:12:34.183Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad979904d27ba8daa217ed5
Added to database: 10/22/2026, 02:48:48 UTC
Last updated: 10/22/2026, 02:48:48 UTC
Views: 1
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