🛡️ CVE-2026-40020 on Alpine — dovecot

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Attacker can use the IMAP SETACL command to inject the anyone permission to user's dovecot-acl file even if imap_acl_allow_anyone=no. This causes folders to be spammed to all users. The impact is limited to being able to spam folders to other users, no unexpected access is gained. Install to fixed version. No publicly available exploits are known.

Distribution advisory

This page covers CVE-2026-40020 as tracked by Alpine, for the package dovecot. The fix is available in version 2.4.4-r0; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability low.

Affected software

ALPINE-CVE-2026-40020 is recorded against 1 package.

  • dovecot (fixed in 2.4.4-r0)

Timeline and source

Published on 12 May 2026 and last revised on 5 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security.alpinelinux.org (Advisory)

CVE-2026-40020 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-05-12
Updated 2026-08-11
Modified 2026-08-05
Fix URL N/A

Affected Packages

Software From version Fixed in
dovecot — 2.4.4-r0

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