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CVE-2026-52681

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 2.3.15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3.1.0版本至3.1.6之前版本，以及OX Dovecot CE 2.3.15版本至2.4.5之前版本存在资源管理错误漏洞，该漏洞源于Sieve CPU资源使用情况在编译脚本中跟踪，具有有效凭据的攻击者可通过反复更改活动脚本重置计数，且删除或重命名脚本时编译脚本文件未删除

CVSS 3.1 · Low EPSS 0.30% · P21

Affected Version Matrix 4

VendorProduct Version RangeStatus
Open-Xchange GmbH OX Dovecot CE 2.3.15< 2.4.5 affected
Open-Xchange GmbH OX Dovecot Pro 2.3.15< 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-2026-52681

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Sieve CPU resource usage is tracked in the compiled script, so an attacker that has valid credentials can reset the accounting by repeatedly changing the active script. Compiled script files are also not removed when a script is deleted or renamed. The configured Sieve CPU limit can be bypassed, allowing sustained CPU consumption, and the leftover files increase disk consumption. Both can cause degradation of service for mail delivery. Monitor system for abnormal CPU usage and disk consumption. 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:H/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
循环内过多的平台资源消耗
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 2.3.15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3.1.0版本至3.1.6之前版本，以及OX Dovecot CE 2.3.15版本至2.4.5之前版本存在资源管理错误漏洞，该漏洞源于Sieve CPU资源使用情况在编译脚本中跟踪，具有有效凭据的攻击者可通过反复更改活动脚本重置计数，且删除或重命名脚本时编译脚本文件未删除
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 2.3.15 ~ 2.3.22.2 -
Open-Xchange GmbH OX Dovecot CE 2.3.15 ~ 2.4.5 -

II. Public POCs for CVE-2026-52681

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III. Intelligence Information for CVE-2026-52681

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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-2026-33605 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-2026-73208 7.4 HIGH Open-Xchange Dovecot Pro 授权问题漏洞
CVE-2026-40018 7.4 HIGH Open-Xchange Dovecot Pro SQL注入漏洞
CVE-2026-73209 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-2026-40014 6.5 MEDIUM Open-Xchange Dovecot Pro 资源管理错误漏洞
CVE-2026-52687 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-2026-33263 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-2026-33607 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

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-1050

V. Comments for CVE-2026-52681

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