Description

Attacker can send a specifically crafted message before authentication that causes managesieve to allocate large amount of memory. Attacker can force managesieve-login to be unavailable by repeatedly crashing the process. Protect access to managesieve protocol, or install fixed version. No publicly available exploits are known.

INFO

Published Date :

2026-03-27T08:10:21.424Z

Last Modified :

2026-03-27T12:37:09.762Z

Source :

OX
AFFECTED PRODUCTS

The following products are affected by CVE-2026-27858 vulnerability.

Vendors Products
Dovecot
  • Dovecot
Open-xchange
  • Dovecot
  • Ox Dovecot Pro
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-27858.

URL Resource
https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-27858 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-27858 cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact