CVE-2026-40013
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.
拥有有效凭证的攻击者可以提交包含极端数值字面量的 Sieve 脚本，导致 ManageSieve 服务在编译该脚本时发生越界写入。这会引发内存损坏，并观察到 ManageSieve 进程崩溃，从而导致脚本管理功能的服务不可用。该漏洞也可能被利用以实现远程代码执行。如果用户不需要远程 Sieve 脚本管理功能，请禁用 ManageSieve 服务。更新至不受影响的版本。目前尚无公开的利用代码（explos）已知。
Possible ATT&CK Techniques 1 AI
T1204 · User Execution
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-40013
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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 has valid credentials can submit a Sieve script containing an extreme numeric literal, which causes an out-of-bounds write when the ManageSieve service compiles the script. This causes memory corruption and an observed crash of the ManageSieve process, resulting in denial of service for script management. This might be able to be used for remote code execution. Disable the ManageSieve service if users do not need remote Sieve script management. 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:L
Source: CVE Program / CVE List V5
Vulnerability Type
缓冲区下溢
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-2026-40013
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-40013
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-2026-27852 | 7.5 HIGH | Dovecot 特定版本 IMAP 邮件解析内存耗尽 DoS |
| CVE-2026-73208 | 7.4 HIGH | Dovecot OAuth2 audience 冒充 scope 导致越权 |
| CVE-2026-40018 | 7.4 HIGH | 未知软件：无已知公开利用 |
| CVE-2026-73209 | 6.5 MEDIUM | IMAP服务栈溢出拒绝服务漏洞 |
| CVE-2026-40017 | 6.5 MEDIUM | Dovecot特定版本IMAP THREAD命令哈希碰撞DoS漏洞 |
| CVE-2026-40014 | 6.5 MEDIUM | IMAP THREAD命令致高CPU占用，修复指定版本 |
| CVE-2026-52687 | 6.5 MEDIUM | Dovecot IMAP压缩算法致拒绝服务 |
| CVE-2026-40019 | 5.9 MEDIUM | ManageSieve 0.6.1 存在 CPU 耗尽型拒绝服务漏洞 |
| CVE-2026-33604 | 5.9 MEDIUM | Dovecot SMTP邮件走私漏洞 |
| 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-2026-33263 | 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-2026-42395 | 4.3 MEDIUM | OpenSSH可信代理NUL字节致登录进程崩溃 |
| CVE-2026-33607 | 4.3 MEDIUM | IMAP LIST命令致CPU耗尽或DoS |
| CVE-2026-40015 | 4.3 MEDIUM | IMAP-hibernate越界读致进程崩溃 |
| 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-124
-
CVE-2026-73075
Vim: Out-of-bounds Access in Popup Opacity Handling -
CVE-2026-16439
Eclipse OpenJ9 : Using -Xtrace to trace method arguments can -
CVE-2026-26199
Buffer underflow in `H5Iget_name `/`H5G_get_name` if size is -
CVE-2026-44631
Apache HTTP Server: Heap Underflow in `ap_regname` via Signe -
CVE-2024-36343
AMD多款产品 安全漏洞
V. Comments for CVE-2026-40013
No comments yet