Attacker can use a specially crafted base64 exchange between Dovecot and Client to fake SCRAM TLS channel binding. This requires that the attacker is able to position itself between Dovecot and the client connection. If successful, the attacker can eavesdrop communications between Dovecot and client as MITM proxy. Install fixed version. No publicly available exploits are known.
CVSS Details
- CVSS 3.1 Base Score: 5.3
- CVSS 3.1 Vector: (CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade dovecot | Aug 3, 2026 | May 12, 2026 |
| Debian | — | Upgrade dovecot | Jun 1, 2026 | Jun 1, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | May 12, 2026 |
| Ubuntu | — | Upgrade dovecot-core | Jun 2, 2026 | Jun 2, 2026 |
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