Denial of Service Vulnerability in Dovecot by Open-Xchange
CVE-2026-73209

6.5MEDIUM

Key Information:

Vendor

Open-xchange Gmbh

Status
Ox Dovecot Pro
Ox Dovecot Ce
Vendor
CVE Published:
28 August 2026

What is CVE-2026-73209?

A vulnerability exists in Dovecot where an attacker with valid credentials can send maliciously crafted compressed data. This can lead to a stack exhaustion, causing the affected process to crash. The termination of the process results in degradation or denial of service for IMAP services, significantly impacting accessibility. It is crucial to update to the latest non-vulnerable version to mitigate this risk. Currently, no public exploits are known.

Affected Version(s)

OX Dovecot CE 2.3.0 < 2.4.5

OX Dovecot Pro 2.3.0 < 2.3.22.2

OX Dovecot Pro 3.0.0 < 3.0.7

References

https://documentation.open-xchange.com/dovecot/security/a...
vendor-advisory

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.