Description
The IMAP and LMTP components in Dovecot 2.3.9 before 2.3.9.3 mishandle snippet generation when many characters must be read to compute the snippet and a trailing > character exists. This causes a denial of service in which the recipient cannot read all of their messages.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | dovecot23 | 2.3.16-1.6 | openSUSE-SU-2024:10726-1 |
| openSUSE Tumbleweed | dovecot24 | 2.4.0-1.1 | openSUSE-SU-2025:14715-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | dovecot | 2.3.9.3-r0 | — |
| Alpine v3.23 | dovecot | 2.3.9.3-r0 | — |
| Alpine v3.22 | dovecot | 2.3.9.3-r0 | — |
| Alpine v3.21 | dovecot | 2.3.9.3-r0 | — |
| Alpine v3.20 | dovecot | 2.3.9.3-r0 | — |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | dovecot | 2.3.9.3-r0 | — |
| Alpine v3.18 | dovecot | 2.3.9.3-r0 | — |
| Alpine v3.17 | dovecot | 2.3.9.3-r0 | — |
| Alpine v3.16 | dovecot | 2.3.9.3-r0 | — |
| Alpine v3.15 | dovecot | 2.3.9.3-r0 | — |
| Alpine v3.14 | dovecot | 2.3.9.3-r0 | — |
| Alpine v3.13 | dovecot | 2.3.9.3-r0 | — |
| Alpine v3.12 | dovecot | 2.3.9.3-r0 | — |
| Alpine v3.11 | dovecot | 2.3.9.3-r0 | — |
| Alpine v3.10 | dovecot | 2.3.10.1-r0 | — |
| Alpine v3.9 | dovecot | 2.3.10.1-r0 | — |
| Alpine v3.8 | dovecot | 2.3.10.1-r0 | — |
Advisories 3
- openSUSE-SU-2025:14715-1 dovecot24-2.4.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10726-1 dovecot23-2.3.16-1.6 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- WID-SEC-2025-0237 Dovecot: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Feb 2, 2025