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4.3Medium

CVE-2025-59031

Open-Xchange GmbH OX Dovecot Pro Published: (7 months ago)

Description

Dovecot has provided a script to use for attachment to text conversion. This script unsafely handles zip-style attachments. Attacker can use specially crafted OOXML documents to cause unintended files on the system to be indexed and subsequently ending up in FTS indexes. Do not use the provided script, instead, use something else like FTS tika. No publicly available exploits are known.

Weakness (CWE): CWE-200

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

VendorProductVersions
dovecot dovecot < 2.4.3
open-xchange dovecot < 2.3.22.1
Open-Xchange GmbH OX Dovecot Pro ≤ 2.3.0

References and patches

CPE matches (NVD) (3)
  • cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:* < 2.4.3
  • cpe:2.3:a:open-xchange:dovecot:*:*:*:*:pro:*:*:* < 2.3.22.1
  • cpe:2.3:a:open-xchange:dovecot:*:*:*:*:pro:*:*:* ≥ 3.0.0 < 3.1.3

Recent CVEs in the same product — Dovecot

3.1Low
CVE-2026-40020
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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 unexpe…

4.3Medium
CVE-2026-42006
Open-Xchange GmbH OX Dovecot Pro; Red Hat Red Hat Enterprise Linux 10; Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support

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 c…

5.3Medium
CVE-2026-40016
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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. Attacker can use this to degrade server performance and bypass configured CPU time limit…

6.8Medium
CVE-2026-33603
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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. If successful, the attacker can eavesdrop …

7.4High
CVE-2026-27851
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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. This can enable SQL / LDAP injection attacks when used in authentication. Avoid using s…

5.3Medium
CVE-2026-27859
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A mail message containing excessive amount of RFC 2231 MIME parameters causes LMTP to use too much CPU. A suitably formatted mail message causes mail delivery process to consume large amounts of CPU time. Use MTA capabilities to limit RFC 2231 MIME parameters…