This page tracks the Ubuntu fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-42392 →

UBUNTU-CVE-2026-42392

An attacker that has valid credentials can send an invalid IMAP URLFETCH command, which causes uninitialized memory to be included in the error respon...

Original description

The description as published by the source.

An attacker that has valid credentials can send an invalid IMAP URLFETCH command, which causes uninitialized memory to be included in the error response returned to the client. Process memory contents can be disclosed to the client, which may include sensitive data. Disable the IMAP URLAUTH functionality. Update to non-vulnerable version. No publicly available exploits are known.

Source: OSV.dev (Open Source Vulnerabilities) OSV