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CVE PROGRAM SOURCE RECORD7.5 High

CVE-2026-27852

An attacker that can send mail to a user can craft a message whose headers contain a very large number of email addresses or MIME parameters, which causes excessive memory usage wh

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Status
Published
Published
Updated
Assigning organization
OX

Description

An attacker that can send mail to a user can craft a message whose headers contain a very large number of email addresses or MIME parameters, which causes excessive memory usage when the message is later parsed. The message is still delivered, but reading it over IMAP can exhaust the memory limit of the process and terminate it, causing denial of service for the affected user. Update to non-vulnerable version. No publicly available exploits are known.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Open-Xchange GmbH OX Dovecot Pro

Default version status: unaffected

  • 2.3.0 to < 2.3.22.2affected
  • 3.0.0 to < 3.0.7affected
  • 3.1.0 to < 3.1.6affected

Open-Xchange GmbH OX Dovecot CE

Default version status: unaffected

  • 2.3.0 to < 2.4.5affected

References