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CVE-2026-42006

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 OX Dovecot Pro是德国Open-Xchange公司的一个邮件存储与投递系统。 Open-Xchange OX Dovecot Pro存在资源管理错误漏洞，该漏洞源于IMAP过度使用大括号导致未控制的内存使用，可能导致内存消耗达到配置限制。

CVSS 4.3 · Medium EPSS 0.82% · P56

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 3

VendorProduct Version RangeStatus
Open-Xchange GmbH OX Dovecot Pro ≤ 3.0.5 affected
≤ 3.1.4 affected
≤ 2.4.3 affected
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I. Basic Information for CVE-2026-42006

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
An attacker can cause uncontrolled memory usage with excessive bracing over IMAP. The fix in CVE-2026-27857 was incomplete, only blocking one way of doing this, so there was still another way left open. In particular, the fix was for closing braces, but you could still use open braces to bypass the limit. Using excessive bracing, attacker can cause memory usage up to configured memory limit. Install fixed version, or configure vsz_limit for imap process to low value. 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
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Open-Xchange OX Dovecot Pro 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open-Xchange OX Dovecot Pro是德国Open-Xchange公司的一个邮件存储与投递系统。 Open-Xchange OX Dovecot Pro存在资源管理错误漏洞，该漏洞源于IMAP过度使用大括号导致未控制的内存使用，可能导致内存消耗达到配置限制。
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 0 ~ 3.0.5 -

II. Public POCs for CVE-2026-42006

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III. Intelligence Information for CVE-2026-42006

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Vendor Advisories for CVE-2026-42006 (1)

Same Patch Batch · Open-Xchange GmbH · 2026-05-12 · 5 CVEs total

CVE-2026-27851 7.4 HIGH Open-Xchange OX Dovecot Pro 安全漏洞
CVE-2026-33603 6.8 MEDIUM Open-Xchange OX Dovecot Pro 安全漏洞
CVE-2026-40016 5.3 MEDIUM Open-Xchange OX Dovecot Pro 资源管理错误漏洞
CVE-2026-40020 3.1 LOW Open-Xchange OX Dovecot Pro 访问控制错误漏洞

IV. Related Vulnerabilities

Same product: OX Dovecot Pro
Same vendor: Open-Xchange GmbH
Same weakness: CWE-400

V. Comments for CVE-2026-42006

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