Infinite loop in Roundcube Webmail - #VU136901
Published: July 5, 2026
Vulnerability identifier: #VU136901
CSH Severity: Medium
CVSS v4.0: 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/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-835
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Roundcube
Affected software:
Roundcube Webmail
Roundcube Webmail
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an infinite loop in the tnef (winmail.dat) decoder when parsing a tnef attachment. A remote attacker can send a specially crafted tnef file to cause a denial of service.
Remediation
Install security update from vendor's website.