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.
能够向用户发送邮件的攻击者可以构造一封电子邮件，其邮件头中包含大量邮箱地址或MIME参数，导致邮件后续被解析时产生过度的内存占用。尽管该邮件仍然会被投递，但通过 IMAP 读取此邮件时可能会耗尽进程的内存限制，从而导致进程终止，进而对受影响用户造成拒绝服务（DoS）。请更新到不受影响的版本。目前尚无已知公开的利用方式（exploit）。
Possible ATT&CK Techniques 1 AI
T1499.001 · OS Exhaustion Flood
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-27852
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
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
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
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-27852
请登录查看更多情报信息。
Same Patch Batch · Open-Xchange GmbH · 2026-08-28 · 25 CVEs total
| CVE-2026-42007 | 9.1 CRITICAL | OpenWebmail 6.0 及之前版本 内存越界写漏洞 |
| CVE-2026-42391 | 7.5 HIGH | IMAP未认证ID命令引发内存与CPU资源耗尽 |
| CVE-2026-33605 | 7.5 HIGH | ManageSieve 认证前畸形命令崩溃DoS漏洞 |
| CVE-2026-40018 | 7.4 HIGH | 未知软件：无已知公开利用 |
| CVE-2026-73208 | 7.4 HIGH | Dovecot OAuth2 audience 冒充 scope 导致越权 |
| CVE-2026-52687 | 6.5 MEDIUM | Dovecot IMAP压缩算法致拒绝服务 |
| CVE-2026-40014 | 6.5 MEDIUM | IMAP THREAD命令致高CPU占用，修复指定版本 |
| CVE-2026-40017 | 6.5 MEDIUM | Dovecot特定版本IMAP THREAD命令哈希碰撞DoS漏洞 |
| CVE-2026-73209 | 6.5 MEDIUM | IMAP服务栈溢出拒绝服务漏洞 |
| CVE-2026-33604 | 5.9 MEDIUM | Dovecot SMTP邮件走私漏洞 |
| CVE-2026-40019 | 5.9 MEDIUM | ManageSieve 0.6.1 存在 CPU 耗尽型拒绝服务漏洞 |
| CVE-2026-40205 | 5.9 MEDIUM | OAuth2 令牌校验缺陷，远程验证未强制作用域 |
| CVE-2026-33606 | 4.8 MEDIUM | Dovecot dsync流协议邮件内容注入漏洞 |
| CVE-2026-33607 | 4.3 MEDIUM | IMAP LIST命令致CPU耗尽或DoS |
| CVE-2026-42395 | 4.3 MEDIUM | OpenSSH可信代理NUL字节致登录进程崩溃 |
| CVE-2026-33263 | 4.3 MEDIUM | 提交登录模块崩溃：高并发下连接上限触发 epoll 异常 |
| CVE-2026-40015 | 4.3 MEDIUM | IMAP-hibernate越界读致进程崩溃 |
| CVE-2026-40013 | 4.3 MEDIUM | ManageSieve 越界写导致拒绝服务漏洞 |
| CVE-2026-42392 | 4.3 MEDIUM | 该漏洞影响某软件的IMAP URLAUTH功能，版本未知，类型为信息泄露 |
| CVE-2026-42008 | 4.3 MEDIUM | Dovecot 受信代理认证字段注入漏洞 |
Showing top 20 of 25 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same weakness: CWE-400
-
CVE-2026-82260
SvelteKit before 2.52.2 Memory Exhaustion via Remote Form De -
CVE-2026-82261
SvelteKit before 2.52.2 CPU Exhaustion via Remote Form Deser -
CVE-2026-82256
SvelteKit before 2.69.1 Denial of Service via Remote Form -
CVE-2026-82235
filebrowser through 2.63.23 Denial of Service via named pipe -
CVE-2026-52687
Dovecot IMAP压缩算法致拒绝服务
V. Comments for CVE-2026-27852
No comments yet