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#23051: dovecot-2.4.4
-----------------------------+------------------------------
Reporter: Douglas R. Reno | Owner: Douglas R. Reno
Type: enhancement | Status: assigned
Priority: high | Milestone: 13.1
Component: BOOK | Version: git
Severity: normal | Resolution:
Keywords: |
-----------------------------+------------------------------
Changes (by Douglas R. Reno):
* summary: dovecot-2.4.3 => dovecot-2.4.4
Comment:
Now 2.4.4.
{{{
Hi!
We're sharing our latest advisory with you and like to thank everyone who
contributed in
finding and solving those vulnerabilities. This advisory is also published
at https://
documentation.open-xchange.com/dovecot/security/advisories/html/2026/oxdc-
adv-2026-0002.html
---
Classification: TLP:GREEN
Internal reference: DOV-8967
Type: CWE-235 (Improper Handling of Extra Parameters)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX Dovecot Pro core 3.1.4, OX Dovecot CE core
2.4.3
First fixed revision: OX Dovecot Pro core 3.1.5, OX Dovecot CE core 2.4.4
Discovery date: 2026-03-29
Solution date: 2026-05-05
Disclosure date: 2026-05-05
Researcher credits: caprinuxx@yeswehack
CVE: CVE-2026-27851
CVSS: 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)
Details:
lib-var-expand: Safe filter leaks to all following pipelines. When safe
filter is used
with variable expansion, all following pipelines on the same string are
incorrectly
interpreted as safe too, enabling unsafe data to be unescaped.
Risk:
This can enable SQL / LDAP injection attacks when used in authentication.
No publicly
available exploits are known.
Solution:
Avoid using safe filter until on fixed version.
---
Internal reference: DOV-8948
Type: CWE-400 (Uncontrolled Resource Consumption)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX Dovecot Pro core 2.3.0
First fixed revision: OX Dovecot Pro core 3.1.5, OX Dovecot CE core 2.4.4
Discovery date: 2026-03-24
Solution date: 2026-05-05
Disclosure date: 2026-05-05
Researcher credits: djvirus@yeswehack
CVE: CVE-2026-40016
CVSS: 5.3 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H)
Details:
Sieve :contains/:matches O(N×M) Substring Match Bypasses
sieve_max_cpu_time Limit (130×
Overrun). Attacker can upload a malicious Sieve script over ManageSieve
service (or
locally) to bypass configured CPU time limits for Sieve up to 130 times of
the
configured limit.
Risk:
Attacker can use this to degrade server performance and bypass configured
CPU time
limits for Sieve scripts. No publicly available exploits are known.
Solution:
Install fixed version, or alternatively prevent direct access to Sieve
scripts via
ManageSieve or local access.
---
Internal reference: DOV-9030
Type: CWE-99 (Improper Control of Resource Identifiers ('Resource
Injection'))
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX Dovecot Pro core 3.1.0, OX Dovecot CE core
2.4.0
First fixed revision: OX Dovecot Pro core 3.1.5, OX Dovecot CE core 2.4.4
Discovery date: 2026-04-08
Solution date: 2026-05-05
Disclosure date: 2026-05-05
Researcher credits: ylwango613@yeswehack
CVE: CVE-2026-33603
CVSS: 6.8 (CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)
Details:
login: Base64 input can contain tabs that bypass IPC protection. Attacker
can use a
specially crafted base64 exchange between Dovecot and Client to fake SCRAM
TLS channel
binding. This requires that the attacker is able to position itself
between Dovecot and
the client connection.
Risk:
If successful, the attacker can eavesdrop communications between Dovecot
and client as
MITM proxy. No publicly available exploits are known.
Solution:
Install fixed version.
---
Internal reference: DOV-9040
Type: CWE-284 (Improper Access Control)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX Dovecot Pro core 2.3.0
First fixed revision: OX Dovecot Pro core 3.1.5, OX Dovecot CE core 2.4.4
Discovery date: 2026-04-08
Solution date: 2026-05-05
Disclosure date: 2026-05-05
Researcher credits: ilhamaf@yeswehack
CVE: CVE-2026-40020
CVSS: 3.1 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L)
Details:
IMAP folders can be shared-spammed to everyone. 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.
Risk:
The impact is limited to being able to spam folders to other users, no
unexpected access
is gained. No publicly available exploits are known.
Solution:
Install to fixed version.
---
Internal reference: DOV-9138
Type: CWE-400 (Uncontrolled Resource Consumption)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX Dovecot Pro core 3.0.5, OX Dovecot Pro core
3.1.4, OX Dovecot
CE core 2.4.3
First fixed revision: OX Dovecot Pro core 3.1.5, OX Dovecot CE core 2.4.4
Discovery date: 2026-04-27
Solution date: 2026-05-05
Disclosure date: 2026-05-05
Researcher credits: D4RKCYPH3R@yeswehack
CVE: CVE-2026-42006
CVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)
Details:
imap-login: Excessive memory usage DoS - Try 2. 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 closing braces, but you could still use open
braces to
bypass the limit.
Risk:
Using excessive bracing, attacker can cause memory usage up to configured
memory limit.
No publicly available exploits are known.
Solution:
Install fixed version, or configure vsz_limit for imap process to low
value.
}}}
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