Allocation of Resources Without Limits or Throttling Affecting dovecot package, versions [,2.4.3)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published31 Mar 2026
- disclosed27 Mar 2026
- creditUnknown
Introduced: 27 Mar 2026
CVE-2026-27859 (opens in a new tab)How to fix?
Upgrade dovecot to version 2.4.3 or higher.
Overview
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling through the processing of mail messages containing an excessive number of RFC 2231 MIME parameters. An attacker can cause the LMTP process to consume excessive CPU resources by sending specially crafted mail messages.