CVE-2026-27856: Doveadm credentials are verified using direct comparison whi...
Summary
Doveadm credentials are verified using direct comparison which is susceptible to timing oracle attack. An attacker can use this to determine the configured credentials. Figuring out the credential will lead into full access to the affected component. Limit access to the doveadm http service port, in
Threat Analysis
**Vulnerability ID:** CVE-2026-27856
**CVSS Score:** 7.4 (High)
**Description:** Doveadm credentials are verified using direct comparison which is susceptible to timing oracle attack. An attacker can use this to determine the configured credentials. Figuring out the credential will lead into full access to the affected component. Limit access to the doveadm http service port, install fixed version. No publicly available exploits are known.
**Recommended Mitigations:** - Apply vendor security patches immediately - Review and update security configurations - Monitor systems for signs of compromise - Implement network segmentation where applicable