CVE-2026-40019
Fixed in a distro release EPSS <1%CVSS 5.9
An unauthenticated attacker can send a truncated quoted argument to the ManageSieve login process, which makes it spin in an infinite loop consuming CPU. This can cause degradation or denial of service for Sieve script management, and repeated connections can consume all available CPU on the server. Monitor system for abnormal CPU usage and kill the offending process. Restrict network access to the ManageSieve service to trusted clients. Update to non-vulnerable version. No publicly available exploits are known.
Products: Open-Xchange GmbH OX Dovecot CE
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux 10 | dovecot | 1:2.3.21-19.el10_2.8 |
| AlmaLinux 10 | dovecot-devel | 1:2.3.21-19.el10_2.8 |
| AlmaLinux 10 | dovecot-mysql | 1:2.3.21-19.el10_2.8 |
| AlmaLinux 10 | dovecot-pgsql | 1:2.3.21-19.el10_2.8 |
| AlmaLinux 10 | dovecot-pigeonhole | 1:2.3.21-19.el10_2.8 |
| AlmaLinux 8 | dovecot | 1:2.3.16-16.el8_10 |
| AlmaLinux 8 | dovecot-devel | 1:2.3.16-16.el8_10 |
| AlmaLinux 8 | dovecot-mysql | 1:2.3.16-16.el8_10 |
| AlmaLinux 8 | dovecot-pgsql | 1:2.3.16-16.el8_10 |
| AlmaLinux 8 | dovecot-pigeonhole | 1:2.3.16-16.el8_10 |
| AlmaLinux 9 | dovecot | 1:2.3.16-18.el9_8.8 |
| AlmaLinux 9 | dovecot-devel | 1:2.3.16-18.el9_8.8 |
| AlmaLinux 9 | dovecot-mysql | 1:2.3.16-18.el9_8.8 |
| AlmaLinux 9 | dovecot-pgsql | 1:2.3.16-18.el9_8.8 |
| AlmaLinux 9 | dovecot-pigeonhole | 1:2.3.16-18.el9_8.8 |
| Alpine 3.23 | dovecot | 2.4.5-r0 |
| Alpine 3.24 | dovecot | 2.4.5-r0 |
| Debian 14 | dovecot | 1:2.4.5+dfsg1-1 |
| Red Hat Enterprise Linux 10.2 | dovecot | 1:2.3.21-19.el10_2.8 |
| Red Hat Enterprise Linux 10.2 | dovecot-debuginfo | 1:2.3.21-19.el10_2.8 |
| Red Hat Enterprise Linux 10.2 | dovecot-debugsource | 1:2.3.21-19.el10_2.8 |
| Red Hat Enterprise Linux 10.2 | dovecot-devel | 1:2.3.21-19.el10_2.8 |
| Red Hat Enterprise Linux 10.2 | dovecot-mysql | 1:2.3.21-19.el10_2.8 |
| Red Hat Enterprise Linux 10.2 | dovecot-mysql-debuginfo | 1:2.3.21-19.el10_2.8 |
| Red Hat Enterprise Linux 10.2 | dovecot-pgsql | 1:2.3.21-19.el10_2.8 |
| Red Hat Enterprise Linux 10.2 | dovecot-pgsql-debuginfo | 1:2.3.21-19.el10_2.8 |
| Red Hat Enterprise Linux 10.2 | dovecot-pigeonhole | 1:2.3.21-19.el10_2.8 |
| Red Hat Enterprise Linux 10.2 | dovecot-pigeonhole-debuginfo | 1:2.3.21-19.el10_2.8 |
| Red Hat Enterprise Linux 8 | dovecot | 1:2.3.16-16.el8_10 |
| Red Hat Enterprise Linux 8 | dovecot-debuginfo | 1:2.3.16-16.el8_10 |
| Red Hat Enterprise Linux 8 | dovecot-debugsource | 1:2.3.16-16.el8_10 |
| Red Hat Enterprise Linux 8 | dovecot-devel | 1:2.3.16-16.el8_10 |
| Red Hat Enterprise Linux 8 | dovecot-mysql | 1:2.3.16-16.el8_10 |
| Red Hat Enterprise Linux 8 | dovecot-mysql-debuginfo | 1:2.3.16-16.el8_10 |
| Red Hat Enterprise Linux 8 | dovecot-pgsql | 1:2.3.16-16.el8_10 |
| Red Hat Enterprise Linux 8 | dovecot-pgsql-debuginfo | 1:2.3.16-16.el8_10 |
| Red Hat Enterprise Linux 8 | dovecot-pigeonhole | 1:2.3.16-16.el8_10 |
| Red Hat Enterprise Linux 8 | dovecot-pigeonhole-debuginfo | 1:2.3.16-16.el8_10 |
| Red Hat Enterprise Linux 9 | dovecot | 1:2.3.16-18.el9_8.8 |
| Red Hat Enterprise Linux 9 | dovecot-debuginfo | 1:2.3.16-18.el9_8.8 |
| Red Hat Enterprise Linux 9 | dovecot-debugsource | 1:2.3.16-18.el9_8.8 |
| Red Hat Enterprise Linux 9 | dovecot-devel | 1:2.3.16-18.el9_8.8 |
| Red Hat Enterprise Linux 9 | dovecot-mysql | 1:2.3.16-18.el9_8.8 |
| Red Hat Enterprise Linux 9 | dovecot-mysql-debuginfo | 1:2.3.16-18.el9_8.8 |
| Red Hat Enterprise Linux 9 | dovecot-pgsql | 1:2.3.16-18.el9_8.8 |
| Red Hat Enterprise Linux 9 | dovecot-pgsql-debuginfo | 1:2.3.16-18.el9_8.8 |
| Red Hat Enterprise Linux 9 | dovecot-pigeonhole | 1:2.3.16-18.el9_8.8 |
| Red Hat Enterprise Linux 9 | dovecot-pigeonhole-debuginfo | 1:2.3.16-18.el9_8.8 |
| Rocky Linux 10 | dovecot | 1:2.3.21-19.el10_2.8 |
| Rocky Linux 8 | dovecot | 1:2.3.16-16.el8_10 |
| Rocky Linux 9 | dovecot | 1:2.3.16-18.el9_8.8 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | dovecot23 | 2.3.21.1-150200.76.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | dovecot23 | 2.3.21.1-150200.76.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | dovecot23 | 2.3.21.1-150200.76.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | dovecot23 | 2.3.21.1-150200.76.1 |
| SUSE Linux Enterprise Module for Server Applications 15 SP7 | dovecot23 | 2.3.21.1-150200.76.1 |
| SUSE Linux Enterprise Server 12 SP5-LTSS | dovecot22 | 2.2.31-19.40.1 |
| SUSE Linux Enterprise Server 15 SP4-LTSS | dovecot23 | 2.3.21.1-150200.76.1 |
| SUSE Linux Enterprise Server 15 SP5-LTSS | dovecot23 | 2.3.21.1-150200.76.1 |
| SUSE Linux Enterprise Server 15 SP6-LTSS | dovecot23 | 2.3.21.1-150200.76.1 |
| SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 | dovecot22 | 2.2.31-19.40.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | dovecot23 | 2.3.21.1-150200.76.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | dovecot23 | 2.3.21.1-150200.76.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | dovecot23 | 2.3.21.1-150200.76.1 |
| Ubuntu 16.04 LTS | dovecot | no fix |
| Ubuntu 18.04 LTS | dovecot | no fix |
| Ubuntu 20.04 LTS | dovecot | no fix |
| Ubuntu 22.04 LTS | dovecot | no fix |
| Ubuntu 24.04 LTS | dovecot | no fix |
| Ubuntu 26.04 LTS | dovecot | no fix |
| Ubuntu Pro 14.04 LTS | dovecot | no fix |
| openSUSE Tumbleweed | dovecot24 | 2.4.5-1.1 |