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    CVE-2026-73209

    An attacker that has valid credentials can send crafted compressed data that causes the affected process to exhaust its stack and crash. The affected process is terminated, which can cause degradation or denial of service for IMAP. Update to non-vulnerable version. No publicly available exploits are known.

    Published:Aug 28, 2026
    Last Modified:Sep 1, 2026
    EPS:Aug 28, 2026
    EPSS Score:0.00321
    CVSS Score:6.5

    Affected Products

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

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-73208 (CVSS 7.4) — An attacker that holds a token intended for a different purpose can authenticate, because when an OAuth2 token…
    CVE-2026-52687 (CVSS 6.5) — An attacker that has valid credentials can select a compression algorithm for the IMAP connection whose decomp…
    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…
    CVE-2026-42395 (CVSS 4.3) — A host listed as a trusted proxy can send forwarding information containing a NUL byte, which crashes the logi…
    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…
    CVE-2026-42008 (CVSS 4.3) — Forwarding information received from a host listed as a trusted proxy is not kept separate from Dovecot's own …
    CVE-2026-42007 (CVSS 9.1) — An attacker that has valid credentials can use a Sieve script with the editheader extension to trigger a use-a…
    CVE-2026-40205 (CVSS 5.9) — An attacker that holds an OAuth2 token granting only part of the required scopes can authenticate, because whe…

    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