Expired Pointer Dereference Affecting dovecot package, versions [2.3.0,2.4.5)
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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- published24 Sept 2026
- disclosed28 Aug 2026
- creditUnknown
Introduced: 28 Aug 2026
CVE-2026-42007 (opens in a new tab)How to fix?
Upgrade dovecot to version 2.4.5 or higher.
Overview
Affected versions of this package are vulnerable to Expired Pointer Dereference in the editheader process. An attacker can cause memory corruption and potentially crash the mail delivery process or execute arbitrary code by submitting a specially crafted Sieve script after authenticating with valid credentials and when the Sieve editheader extension is enabled. This is only exploitable if the Sieve editheader extension is enabled and the attacker has valid credentials.
Workaround
This vulnerability can be mitigated by disabling the Sieve editheader extension in the configuration and restarting the service.