What is CVE-2026-42006?

CVE-2026-42006 is a medium-severity vulnerability in Dovecot, classified under Uncontrolled Resource Consumption. CVSS score: 4.3/10. Published 2026-05-12.

How severe is CVE-2026-42006?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Resource exhaustion in Dovecot

CVE-2026-42006

An attacker can cause uncontrolled memory usage with excessive bracing over IMAP. The fix in CVE-2026-27857 was incomplete, only blocking one way of doing this, so there was still another way left open. In particular, the fix was for closi…

Vulnerability class: DoS (Denial of Service)

EPSS: 0.000 (2.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.

Affected products

Dovecot
Open-xchange Dovecot
Open-xchange Gmbh Ox Dovecot Pro — versions 0

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

security@open-xchange.com (vendor-advisory, Issue Tracking)

Frequently asked questions

What is CVE-2026-42006?: CVE-2026-42006 is a medium-severity vulnerability in Dovecot, classified under Uncontrolled Resource Consumption. CVSS score: 4.3/10. Published 2026-05-12.
How severe is CVE-2026-42006?: Medium severity. CVSS v3 base score is 4.3 out of 10.