Allocation of Resources Without Limits or Throttling in Roundcube Webmail - #VU136900
Published: July 5, 2026
Vulnerability identifier: #VU136900
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 cause a denial of service.
The vulnerability exists due to improper handling of crafted compressed-rtf size 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.
Affected software
Roundcube Webmail
Remediation
Install security update from vendor's website.
Roundcube Webmail - addressed in versions 1.6.17, 1.7.2