CVE-2026-114731
CVE-2026-114731
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.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: mitreFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: mitreFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: mitreFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: mitreAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| Webmail Roundcube |
≥ 1.6.0; < 1.6.20 (affected, semver) ≥ 1.7.0; < 1.7.5 (affected, semver) Other versions: unaffected |
CNA: mitre |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 5.3 medium |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L | CNA: mitre |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://bugs.debian.org/1151279CNA: mitre · issue-tracking, third-party-advisory
- https://github.com/roundcube/roundcubemail/commit/2c9f6da692fa37cad2aaf85d5b127b583d22b264CNA: mitre · patch
- https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5CNA: mitre · vendor-advisory, release-notes
- https://github.com/roundcube/roundcubemail/releases/tag/1.7.5CNA: mitre · release-notes, patch
- https://github.com/roundcube/roundcubemail/releases/tag/1.6.20CNA: mitre · release-notes, patch
- https://github.com/roundcube/roundcubemail/commit/99a5bdd05b01f45493cc0da4c96968eac7668126CNA: mitre · patch
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