Allocation of Resources Without Limits or Throttling in Roundcube Webmail - #VU156147
Published: October 19, 2026
Vulnerability identifier: #VU156147
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass image processing resource limits and potentially cause a denial of service.
The vulnerability exists due to inconsistent enforcement of resource limits in thumbnail generation when processing falls back from ImageMagick to GD. A remote attacker can supply image content that triggers the GD fallback to bypass ImageMagick resource limits and potentially exhaust server resources.
Affected software
Roundcube Webmail
Remediation
Install security update from vendor's website.
Roundcube Webmail - addressed in versions 1.6.20, 1.7.5