This page tracks the Ubuntu fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-27852 →

UBUNTU-CVE-2026-27852

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 ca...

Original description

The description as published by the source.

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.

Source: OSV.dev (Open Source Vulnerabilities) OSV