Medium [CVE-2026-33606] Unauthorized mailbox modification via dsync command injection
This medium-severity Red Hat Linux advisory covers CVE-2026-33606 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7.
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Summary
Mail content stored by a user can be crafted so that it is interpreted as dsync protocol commands when an administrator later runs dsync with the stream protocol, for example during a migration.
Injected commands can modify mailbox state on the destination during migration or replication, including internal mailbox attributes that a user should not be able to set directly. It can also cause dsync errors.
Avoid running dsync with the stream protocol on mailboxes with untrusted content. Update to non-vulnerable version.
No publicly available exploits are known. A flaw was found in Dovecot.
This could lead to unauthorized data manipulation and potentially cause service disruptions. Red Hat severity: Moderate — CVSS 5.4 (CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:L).
Weakness: CWE-78. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9.
Will not fix / out of support: Red Hat Enterprise Linux 6. Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: dovecot.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- To mitigate this issue, administrators should avoid using the `dsync` utility with the stream protocol when processing mailboxes that contain untrusted user-provided content. This operational control prevents the crafted mail content from being interpreted as `dsync` commands during migration or replication tasks.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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