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CVE-2026-52687

Quick assessment

Affected
Open-Xchange GmbH OX Dovecot Pro
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Open-Xchange Dovecot Pro是德国Open-Xchange公司的一个邮件服务器软件。 Open-Xchange Dovecot Pro和Dovecot CE存在资源管理错误漏洞，该漏洞源于对IMAP连接压缩算法的内存管理不当，具有有效凭据的攻击者可选择解压状态需要大量内存的压缩算法并打开多个此类连接，导致进程内存限制被触发，从而造成IMAP服务降级或拒绝服务。以下版本受到影响：OX Dovecot Pro 2.3.11版本至2.3.22.2之前版本、3.0.0版本至3.0.7之前版本和

CVSS 6.5 · Medium EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 4

VendorProduct Version RangeStatus
Open-Xchange GmbH OX Dovecot CE 2.3.11< 2.4.5 affected
Open-Xchange GmbH OX Dovecot Pro 2.3.11< 2.3.22.2 affected
3.0.0< 3.0.7 affected
3.1.0< 3.1.6 affected
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I. Basic Information for CVE-2026-52687

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
An attacker that has valid credentials can select a compression algorithm for the IMAP connection whose decompression state requires a large amount of memory, and open several such connections. The memory limit of the process is reached with only a few connections, terminating the process and all connections it handles, which can cause degradation or denial of service for IMAP. Disable IMAP compression. Alternatively limit the number of connections handled by a single imap-login process, though this has a performance impact. Update to non-vulnerable version. No publicly available exploits are known.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Open-Xchange Dovecot Pro 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open-Xchange Dovecot Pro是德国Open-Xchange公司的一个邮件服务器软件。 Open-Xchange Dovecot Pro和Dovecot CE存在资源管理错误漏洞，该漏洞源于对IMAP连接压缩算法的内存管理不当，具有有效凭据的攻击者可选择解压状态需要大量内存的压缩算法并打开多个此类连接，导致进程内存限制被触发，从而造成IMAP服务降级或拒绝服务。以下版本受到影响：OX Dovecot Pro 2.3.11版本至2.3.22.2之前版本、3.0.0版本至3.0.7之前版本和
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Open-Xchange GmbH OX Dovecot Pro 2.3.11 ~ 2.3.22.2 -
Open-Xchange GmbH OX Dovecot CE 2.3.11 ~ 2.4.5 -

II. Public POCs for CVE-2026-52687

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III. Intelligence Information for CVE-2026-52687

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Same Patch Batch · Open-Xchange GmbH · 2026-08-28 · 25 CVEs total

CVE-2026-42007 9.1 CRITICAL Open-Xchange Dovecot Pro 资源管理错误漏洞
CVE-2026-42391 7.5 HIGH Open-Xchange Dovecot Pro 资源管理错误漏洞
CVE-2026-27852 7.5 HIGH Open-Xchange Dovecot Pro 资源管理错误漏洞
CVE-2026-33605 7.5 HIGH Open-Xchange Dovecot Pro 资源管理错误漏洞
CVE-2026-40018 7.4 HIGH Open-Xchange Dovecot Pro SQL注入漏洞
CVE-2026-73208 7.4 HIGH Open-Xchange Dovecot Pro 授权问题漏洞
CVE-2026-40014 6.5 MEDIUM Open-Xchange Dovecot Pro 资源管理错误漏洞
CVE-2026-40017 6.5 MEDIUM Open-Xchange Dovecot Pro 资源管理错误漏洞
CVE-2026-73209 6.5 MEDIUM Open-Xchange Dovecot Pro 资源管理错误漏洞
CVE-2026-33604 5.9 MEDIUM Open-Xchange Dovecot Pro 安全漏洞
CVE-2026-40019 5.9 MEDIUM Open-Xchange GmbH OX Dovecot CE 资源管理错误漏洞
CVE-2026-40205 5.9 MEDIUM Open-Xchange Dovecot Pro 授权问题漏洞
CVE-2026-33606 4.8 MEDIUM Open-Xchange Dovecot Pro 输入验证错误漏洞
CVE-2026-33607 4.3 MEDIUM Open-Xchange Dovecot Pro 资源管理错误漏洞
CVE-2026-42395 4.3 MEDIUM Open-Xchange Dovecot Pro 资源管理错误漏洞
CVE-2026-33263 4.3 MEDIUM Open-Xchange Dovecot Pro 资源管理错误漏洞
CVE-2026-40015 4.3 MEDIUM Open-Xchange Dovecot Pro 缓冲区错误漏洞
CVE-2026-40013 4.3 MEDIUM Open-Xchange Dovecot Pro 缓冲区错误漏洞
CVE-2026-42392 4.3 MEDIUM Open-Xchange Dovecot Pro 信息泄露漏洞
CVE-2026-42008 4.3 MEDIUM Open-Xchange Dovecot Pro 授权问题漏洞

Showing top 20 of 25 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: OX Dovecot Pro
Same vendor: Open-Xchange GmbH
Same weakness: CWE-400

V. Comments for CVE-2026-52687

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