VULNERABILITY INTELLIGENCE

CVE-2026-27852

CVSS score7.5 HIGH
EPSS probability0.43%
CISA KEVNot currently listed
Published2026-08-28
Last modified2026-09-03
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Description

An attacker that can send mail to a user can craft a message whose headers contain a very large number of email addresses or MIME parameters, which causes excessive memory usage when the message is later parsed. The message is still delivered, but reading it over IMAP can exhaust the memory limit of the process and terminate it, causing denial of service for the affected user. Update to non-vulnerable version. No publicly available exploits are known.

Weakness classification

  • security@open-xchange.com: CWE-400

Primary references