Description
A flaw was found in dovecot 2.0 up to 2.2.33 and 2.3.0. An abort of SASL authentication results in a memory leak in dovecot's auth client used by login processes. The leak has impact in high performance configuration where same login processes are reused and can cause the process to crash due to memory exhaustion.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| The Dovecot Project | dovecot | 2.0 up to 2.2.33 and 2.3.0 | — |
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.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | dovecot | 1:2.2.34-1 | — |
| Debian 13 | dovecot | 1:2.2.34-1 | — |
| Debian 12 | dovecot | 1:2.2.34-1 | — |
| Debian 9 | dovecot | 1:2.2.27-3+deb9u2 | DSA-4130-1 |
| Debian 8 | dovecot | 1:2.2.13-12~deb8u4 | DSA-4130-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | dovecot | 1:2.1.7-7+deb7u2 | DLA-1333-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | dovecot | 1:2.2.22-1ubuntu2.6 | USN-3556-1 |
| Ubuntu 14.04 LTS | dovecot | 1:2.2.9-1ubuntu2.3 | USN-3556-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | dovecot22 | 2.2.31-19.5.1 | SUSE-SU-2018:0466-1 |
| SLES 12 SP2 | dovecot22 | 2.2.31-19.5.1 | SUSE-SU-2018:0466-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP3 | dovecot22 | 2.2.31-19.5.1 | SUSE-SU-2018:0466-1 |
| SLES for SAP 12 SP2 | dovecot22 | 2.2.31-19.5.1 | SUSE-SU-2018:0466-1 |
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 | 2.3.1-r0 | — |
| Alpine v3.23 | dovecot | 2.3.1-r0 | — |
| Alpine v3.22 | dovecot | 2.3.1-r0 | — |
| Alpine v3.21 | dovecot | 2.3.1-r0 | — |
| Alpine v3.20 | dovecot | 2.3.1-r0 | — |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | dovecot | 2.3.1-r0 | — |
| Alpine v3.18 | dovecot | 2.3.1-r0 | — |
| Alpine v3.17 | dovecot | 2.3.1-r0 | — |
| Alpine v3.16 | dovecot | 2.3.1-r0 | — |
| Alpine v3.15 | dovecot | 2.3.1-r0 | — |
| Alpine v3.14 | dovecot | 2.3.1-r0 | — |
| Alpine v3.13 | dovecot | 2.3.1-r0 | — |
| Alpine v3.12 | dovecot | 2.3.1-r0 | — |
| Alpine v3.11 | dovecot | 2.3.1-r0 | — |
| Alpine v3.10 | dovecot | 2.3.1-r0 | — |
| Alpine v3.9 | dovecot | 2.3.1-r0 | — |
| Alpine v3.8 | dovecot | 2.3.1-r0 | — |
| Alpine v3.7 | dovecot | 2.2.34-r0 | — |
Advisories 7
- USN-3556-1 dovecot vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4130-1 dovecot - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1333-1 dovecot - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2018:0466-1 Security update for dovecot22 SUSE / openSUSE Security Updates · Feb 4, 2026
- 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-2025-0245 Dovecot: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Feb 2, 2025
References
- https://github.com/dovecot/core/commit/1a29ed2f96da1be22fa5a4d96c7583aa81b8b060.patch
- [debian-lts-announce] 20180331 [SECURITY] [DLA 1333-1] dovecot security update mailing-list
- https://bugzilla.redhat.com/show_bug.cgi?id=1532768
- DSA-4130 vendor-advisory
- USN-3556-1 vendor-advisory
- USN-3556-2 vendor-advisory
- [dovecot-news] 20180228 v2.2.34 released mailing-list