Acceptance of Extraneous Untrusted Data With Trusted Data Affecting dovecot package, versions [2.3.4,2.4.5)
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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Test your applications- Snyk IDSNYK-UNMANAGED-DOVECOT-20078963
- published24 Sept 2026
- disclosed28 Aug 2026
- creditUnknown
Introduced: 28 Aug 2026
CVE-2026-42008 (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 Acceptance of Extraneous Untrusted Data With Trusted Data in the auth_proxy_trusted_networks process. An attacker can gain unauthorized access by injecting authentication fields through a malicious host configured as a trusted proxy. This is only exploitable if the password database is configured to honor a field that permits authentication without a password and trusted proxies are enabled.
Workaround
This vulnerability can be mitigated by strictly limiting the auth_proxy_trusted_networks configuration to trusted hosts under administrative control, reviewing and restricting the setting, or removing it entirely if trusted proxies are not required. A restart of the service may be necessary for changes to take effect.