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    CVE-2026-33607

    An attacker that has valid credentials can use IMAP LIST command to consume CPU. This can cause degradation or denial of service for IMAP. Monitor system for abnormal CPU usage and kill the offending process and lock account. Alternatively install fixed version. No publicly available exploits are known.

    Published:Aug 28, 2026
    Last Modified:Sep 1, 2026
    EPS:Aug 28, 2026
    EPSS Score:0.0029
    CVSS Score:4.3

    Affected Products

    Vendor
    Open-xchange
    Product
    Ox Dovecot Ce
    Vendor
    Open-xchange
    Product
    Ox Dovecot Pro

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-52681 (CVSS 3.1) — Sieve CPU resource usage is tracked in the compiled script, so an attacker that has valid credentials can rese…
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    CVE-2026-42393 (CVSS 3.1) — The comparison used for the doveadm password and API key is not fully timing safe and can reveal the length of…
    CVE-2026-42391 (CVSS 7.5) — An unauthenticated attacker can send an IMAP ID command with a very large number of parameters before logging …
    CVE-2026-42392 (CVSS 4.3) — An attacker that has valid credentials can send an invalid IMAP URLFETCH command, which causes uninitialized m…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High