Alerts This Week
Warning Icon 1 677
Alerts This Week
Warning Icon 1 677

Ubuntu 22 24 Dovecot Critical Regression Fix USN-8136-2

ubuntu
Calendar Grey April 28, 2026
Dist Ubuntu Esm H88
A regression for Dovecot affecting Ubuntu 22.04 and 24.04 addresses critical issues to enhance server security.
USN-8136-1 introduced a regression in Dovecot

Summary

USN-8136-1 introduced a regression in Dovecot

Software Description:

- dovecot: IMAP and POP3 email server

Details:

USN-8136-1 fixed vulnerabilities in Dovecot. The update caused a regression

on Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that Dovecot incorrectly handled invalid base64 SASL data.

An attacker could possibly use this issue to cause a denial of service. This

issue only affected Ubuntu 25.10. (CVE-2025-59028)

It was discovered that Dovecot script decode2text.sh incorrectly handled zip

files. An attacker could possibly use this issue to obtain sensitive

information. (CVE-2025-59031)

It was discovered that Dovecot incorrectly handled certain AUTHENTICATE

requests. An attacker could possibly use this issue to cause a denial of

service. (CVE-2025-59032)

It was discovered that Dovecot incorrectly handled certain SQL based

authentication. An attacker ...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu Dovecot regression

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 24.04 LTS
  dovecot-core                    1:2.3.21+dfsg1-2ubuntu6.4

Ubuntu 22.04 LTS
  dovecot-core                    1:2.3.16+dfsg1-3ubuntu2.8

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-8136-2

https://ubuntu.com/security/notices/USN-8136-1

CVE-2026-0394, https://launchpad.net/bugs/2150116

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8136-2

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu Dovecot regression

Package Information

https://launchpad.net/ubuntu/+source/dovecot/1:2.3.21+dfsg1-2ubuntu6.4
https://launchpad.net/ubuntu/+source/dovecot/1:2.3.16+dfsg1-3ubuntu2.8

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.

Your message here