CVE-2026-27852

Published Aug 28, 2026

Last updated 2 months ago

CVSS high 7.5
AWS

Overview

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.
Source
security@open-xchange.com
NVD status
Deferred

Risk scores

CVSS 3.1

Type
Secondary
Base score
7.5
Impact score
3.6
Exploitability score
3.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Severity
HIGH

Weaknesses

security@open-xchange.com
CWE-400

Social media

Hype score
Not currently trending

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References

Sources include official advisories and independent security research.