An unauthenticated attacker can send a truncated quoted argument to the ManageSieve login process, which makes it spin in an infinite loop consuming CPU. This can cause degradation or denial of service for Sieve script management, and repeated connections can consume all available CPU on the server. Monitor system for abnormal CPU usage and kill the offending process. Restrict network access to the ManageSieve service to trusted clients. Update to non-vulnerable version. No publicly available exploits are known.
Metrics
Affected Vendors & Products
References
History
Fri, 28 Aug 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
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| Metrics |
ssvc
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Fri, 28 Aug 2026 14:30:00 +0000
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| Title | Denial of Service via Infinite Loop in ManageSieve Login on OX Dovecot |
Fri, 28 Aug 2026 11:30:00 +0000
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| Description | An unauthenticated attacker can send a truncated quoted argument to the ManageSieve login process, which makes it spin in an infinite loop consuming CPU. This can cause degradation or denial of service for Sieve script management, and repeated connections can consume all available CPU on the server. Monitor system for abnormal CPU usage and kill the offending process. Restrict network access to the ManageSieve service to trusted clients. Update to non-vulnerable version. No publicly available exploits are known. | |
| Weaknesses | CWE-400 | |
| References |
| |
| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: OX
Published:
Updated: 2026-08-28T14:58:20.016Z
Reserved: 2026-04-08T09:59:59.342Z
Link: CVE-2026-40019
Updated: 2026-08-28T14:58:15.887Z
Status : Received
Published: 2026-08-28T12:16:28.770
Modified: 2026-08-28T16:17:57.120
Link: CVE-2026-40019
No data.
OpenCVE Enrichment
Updated: 2026-08-28T14:15:04Z