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.
Metrics
Affected Vendors & Products
References
History
Fri, 28 Aug 2026 21:30:00 +0000
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ssvc
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Fri, 28 Aug 2026 13:00:00 +0000
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| Title | Denial of Service via Large Header Attack in OX Dovecot |
Fri, 28 Aug 2026 11:30:00 +0000
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| 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. | |
| Weaknesses | CWE-400 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: OX
Published: 2026-08-28T10:12:11.070Z
Updated: 2026-08-28T15:55:41.500Z
Reserved: 2026-02-24T08:46:09.373Z
Link: CVE-2026-27852
Updated: 2026-08-28T14:42:14.280Z
Status : Received
Published: 2026-08-28T12:16:27.330
Modified: 2026-08-28T20:17:25.143
Link: CVE-2026-27852
No data.