CVE-2026-27858
- State
- Published
- Severity
- 7.5 High
- Published
- Mar 27, 2026
- Updated
- Jul 15, 2026
- Reserved
- Feb 24, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | OX |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | redhat-SADP |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
OX Dovecot ProOpen-Xchange GmbH |
|
References
- https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.jsonvendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-27858vdb-entry
- RHBZ#2452175issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27858.json
- https://access.redhat.com/errata/RHSA-2026:26564vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:17602vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:13498vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:19149vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:13830vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:19455vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:19453vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:18053vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:17630vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:17628vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:17625vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:17626vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:13857vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:19364vendor-advisory
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