CVE-2026-27852
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 2.3.22.2之前版本、3.0.7之前版本和3.1.6之前版本，以及OX Dovecot CE 2.4.5之前版本存在资源管理错误漏洞，该漏洞源于邮件头包含大量电子邮件地址或MIME参数，导致解析时过度使用内存，可能造成拒绝服务。
Possible ATT&CK Techniques 1 AI
T1499.001 · OS Exhaustion FloodAffected Version Matrix 4
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Open-Xchange GmbH | OX Dovecot CE | 2.3.0< 2.4.5 |
affected |
| Open-Xchange GmbH | OX Dovecot Pro | 2.3.0< 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-2026-27852
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
An attacker that can send mail to a user can craft a message whose headers contain a very large number of email addresses or MIME parameters, which causes excessive memory usage when the message is later parsed. The message is still delivered, but reading it over IMAP can exhaust the memory limit of the process and terminate it, causing denial of service for the affected user. 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:N/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 2.3.22.2之前版本、3.0.7之前版本和3.1.6之前版本，以及OX Dovecot CE 2.4.5之前版本存在资源管理错误漏洞，该漏洞源于邮件头包含大量电子邮件地址或MIME参数，导致解析时过度使用内存，可能造成拒绝服务。
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 | 2.3.0 ~ 2.3.22.2 | - |
|
| Open-Xchange GmbH | OX Dovecot CE | 2.3.0 ~ 2.4.5 | - |
|
II. Public POCs for CVE-2026-27852
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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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-2026-40018 | 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-2026-52687 | 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-2026-40017 | 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 → →
IV. Related Vulnerabilities
Same weakness: CWE-400
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CVE-2026-110832
FreeRDP 2.0.0 before 3.32.0 Memory Exhaustion via DRDYNVC DA -
CVE-2026-110830
FreeRDP before 3.32.0 Denial of Service via Serial IRP_MJ_CR
V. Comments for CVE-2026-27852
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