CVE-2026-40013: Open-Xchange GmbH OX Dovecot Pro vulnerability
Open-Xchange GmbH · OX Dovecot Pro
Vendor fix available · Affected: Open-Xchange GmbH OX Dovecot Pro · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 59% of scored CVEs
DescriptionCVE.org
An attacker that has valid credentials can submit a Sieve script containing an extreme numeric literal, which causes an out-of-bounds write when the ManageSieve service compiles the script. This causes memory corruption and an observed crash of the ManageSieve process, resulting in denial of service for script management. This might be able to be used for remote code execution. Disable the ManageSieve service if users do not need remote Sieve script management. Update to non-vulnerable version. No publicly available exploits are known.
Affected products2
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Open-Xchange GmbH · OX Dovecot Profrom 2.3.0 before 2.3.22.2; from 3.0.0 before 3.0.7; from 3.1.0 before 3.1.6
- Open-Xchange GmbH · OX Dovecot CEfrom 2.3.0 before 2.4.5
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- Open-Xchange GmbH
- Published
- August 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-40013 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.