dovecot: An attacker that has valid credentials can use IMAP LIST command to consume CPU
CVE-2026-33607 is fixed in 12 products on 1 platform, first by SUSE-SU-2026:23595-1, released September 1, 2026. It is not reported as exploited. Patch Radar priority: Routine.
An attacker that has valid credentials can use IMAP LIST command to consume CPU. This can cause degradation or denial of service for IMAP. Monitor system for abnormal CPU usage and kill the offending process and lock account. Alternatively install fixed version. No publicly available exploits are known.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| dovecot · Debian 12.15 (bookworm) | 1:2.3.19.1+dfsg1-2.1+deb12u7 | DEBIAN-CVE-2026-33607 | Sep 10, 2026 |
| dovecot · Debian 13.5 (trixie) | 1:2.4.1+dfsg1-6+deb13u7 | DEBIAN-CVE-2026-33607 | Sep 10, 2026 |
| dovecot · Debian 14 | 1:2.4.5+dfsg1-1 | DEBIAN-CVE-2026-33607 | Sep 10, 2026 |
| dovecot · Fedora 43 | 1:2.4.5-1.fc43 | FEDORA-2026-E8A6485109 | Sep 10, 2026 |
| dovecot-debuginfo · Fedora 43 | 1:2.4.5-1.fc43 | FEDORA-2026-E8A6485109 | Sep 10, 2026 |
| dovecot-debugsource · Fedora 43 | 1:2.4.5-1.fc43 | FEDORA-2026-E8A6485109 | Sep 10, 2026 |
| dovecot-devel · Fedora 43 | 1:2.4.5-1.fc43 | FEDORA-2026-E8A6485109 | Sep 10, 2026 |
| dovecot-mysql · Fedora 43 | 1:2.4.5-1.fc43 | FEDORA-2026-E8A6485109 | Sep 10, 2026 |
| dovecot-mysql-debuginfo · Fedora 43 | 1:2.4.5-1.fc43 | FEDORA-2026-E8A6485109 | Sep 10, 2026 |
| dovecot-pgsql · Fedora 43 | 1:2.4.5-1.fc43 | FEDORA-2026-E8A6485109 | Sep 10, 2026 |
| dovecot-pgsql-debuginfo · Fedora 43 | 1:2.4.5-1.fc43 | FEDORA-2026-E8A6485109 | Sep 10, 2026 |
| dovecot-pigeonhole · Fedora 43 | 1:2.4.5-1.fc43 | FEDORA-2026-E8A6485109 | Sep 10, 2026 |
| dovecot-pigeonhole-debuginfo · Fedora 43 | 1:2.4.5-1.fc43 | FEDORA-2026-E8A6485109 | Sep 10, 2026 |
| dovecot23 · sles 15.6 | 2.3.21.1-150200.76.1 | SUSE-SU-2026:4139-1 | Sep 14, 2026 |
| dovecot23 · sles 15.7 | 2.3.21.1-150200.76.1 | SUSE-SU-2026:4139-1 | Sep 14, 2026 |
| dovecot24 · opensuse-leap 16.0 | 2.4.4-160000.2.1 | OPENSUSE-SU-2026:21720-1 | Sep 1, 2026 |
| dovecot24 · sles 16.0 | 2.4.4-160000.2.1 | SUSE-SU-2026:23595-1 | Sep 1, 2026 |
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