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CVE-2026-42007

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 2.3.0至2.3.22.2之前版本、3.0.0至3.0.7之前版本和3.1.0至3.1.6之前版本，以及OX Dovecot CE 2.3.0至2.4.5之前版本存在资源管理错误漏洞，该漏洞源于邮件编辑代码中的释放后重用。具有有效凭据的攻击者可以利用带有editheader扩展的Sieve脚本触发该漏洞，将内存内容越界写入已投递邮件，导致内存泄漏和内

CVSS 9.1 · Critical EPSS 0.34% · P26

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 4

VendorProduct Version RangeStatus
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-2026-42007

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 use a Sieve script with the editheader extension to trigger a use-after-free in the mail editing code, and to write memory contents beyond the intended buffer into the delivered mail. This causes memory leak and opportunity to do memory corruption during mail delivery, which can crash the delivery process and may allow execution of arbitrary code in the context of that process. Disable the Sieve editheader extension. 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:C/C:L/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
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 2.3.0至2.3.22.2之前版本、3.0.0至3.0.7之前版本和3.1.0至3.1.6之前版本，以及OX Dovecot CE 2.3.0至2.4.5之前版本存在资源管理错误漏洞，该漏洞源于邮件编辑代码中的释放后重用。具有有效凭据的攻击者可以利用带有editheader扩展的Sieve脚本触发该漏洞，将内存内容越界写入已投递邮件，导致内存泄漏和内
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-2026-42007

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III. Intelligence Information for CVE-2026-42007

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

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-2026-52687 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 &rarr; →

IV. Related Vulnerabilities

Same product: OX Dovecot Pro
Same vendor: Open-Xchange GmbH
Same weakness: CWE-416

V. Comments for CVE-2026-42007

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