CVE-2026-52681
3.1
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
Summary
Sieve CPU resource usage is tracked in the compiled script, so an attacker that has valid credentials can reset the accounting by repeatedly changing the active script. Compiled script files are also not removed when a script is deleted or renamed. The configured Sieve CPU limit can be bypassed, allowing sustained CPU consumption, and the leftover files increase disk consumption. Both can cause degradation of service for mail delivery. Monitor system for abnormal CPU usage and disk consumption. Update to non-vulnerable version. No publicly available exploits are known.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Open-Xchange GmbH | OX Dovecot Pro | 2.3.15 < 2.3.22.2 | affected |
| Open-Xchange GmbH | OX Dovecot Pro | 3.0.0 < 3.0.7 | affected |
| Open-Xchange GmbH | OX Dovecot Pro | 3.1.0 < 3.1.6 | affected |
| Open-Xchange GmbH | OX Dovecot CE | 2.3.15 < 2.4.5 | affected |
Weaknesses
- CWE-1050: Excessive Platform Resource Consumption within a Loop
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
- https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json
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