CVE-2026-27859

EUVD-2026-16571
A mail message containing excessive amount of RFC 2231 MIME parameters causes LMTP to use too much CPU. A suitably formatted mail message causes mail delivery process to consume large amounts of CPU time. Use MTA capabilities to limit RFC 2231 MIME parameters in mail messages, or upgrade to fixed version where the processing is limited. No publicly available exploits are known.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: 31.36%
Affected Products (NVD)
VendorProductVersion
dovecotdovecot
𝑥
< 2.4.3
open-xchangedovecot
𝑥
< 3.0.5
open-xchangedovecot
3.1.0 ≤
𝑥
< 3.1.4
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
dovecot
bookworm
1:2.3.19.1+dfsg1-2.1+deb12u6
fixed
bookworm (security)
1:2.3.19.1+dfsg1-2.1+deb12u6
fixed
forky
1:2.4.5+dfsg1-2
fixed
sid
1:2.4.5+dfsg1-2
fixed
trixie
1:2.4.1+dfsg1-6+deb13u6
fixed
trixie (security)
1:2.4.1+dfsg1-6+deb13u6
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
dovecot
bionic
needed
focal
needed
jammy
Fixed 1:2.3.16+dfsg1-3ubuntu2.7
released
noble
Fixed 1:2.3.21+dfsg1-2ubuntu6.3
released
questing
Fixed 1:2.4.1+dfsg1-5ubuntu4.1
released
resolute
not-affected
trusty
needed
xenial
needed
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
dovecot22
suse enterprise sap 12 SP5
2.2.31-19.32.1
fixed
suse enterprise server 12 SP3
2.2.31-19.32.1
fixed
suse enterprise server 12 SP5
2.2.31-19.32.1
fixed
dovecot22-backend-mysql
suse enterprise sap 12 SP5
2.2.31-19.32.1
fixed
suse enterprise server 12 SP3
2.2.31-19.32.1
fixed
suse enterprise server 12 SP5
2.2.31-19.32.1
fixed
dovecot22-backend-pgsql
suse enterprise sap 12 SP5
2.2.31-19.32.1
fixed
suse enterprise server 12 SP3
2.2.31-19.32.1
fixed
suse enterprise server 12 SP5
2.2.31-19.32.1
fixed
dovecot22-backend-sqlite
suse enterprise sap 12 SP5
2.2.31-19.32.1
fixed
suse enterprise server 12 SP3
2.2.31-19.32.1
fixed
suse enterprise server 12 SP5
2.2.31-19.32.1
fixed
dovecot22-devel
suse enterprise sap 12 SP5
2.2.31-19.32.1
fixed
suse enterprise server 12 SP5
2.2.31-19.32.1
fixed
dovecot23
suse enterprise sap 15 SP4
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP5
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP6
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP7
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP4
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP5
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP6
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP7
2.3.21.1-150200.76.1
fixed
dovecot23-backend-mysql
suse enterprise sap 15 SP4
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP5
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP6
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP7
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP4
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP5
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP6
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP7
2.3.21.1-150200.76.1
fixed
dovecot23-backend-pgsql
suse enterprise sap 15 SP4
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP5
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP6
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP7
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP4
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP5
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP6
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP7
2.3.21.1-150200.76.1
fixed
dovecot23-backend-sqlite
suse enterprise sap 15 SP4
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP5
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP6
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP7
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP4
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP5
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP6
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP7
2.3.21.1-150200.76.1
fixed
dovecot23-devel
suse enterprise sap 15 SP4
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP5
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP6
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP7
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP4
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP5
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP6
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP7
2.3.21.1-150200.76.1
fixed
dovecot23-fts
suse enterprise sap 15 SP4
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP5
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP6
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP7
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP4
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP5
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP6
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP7
2.3.21.1-150200.76.1
fixed
dovecot23-fts-lucene
suse enterprise sap 15 SP4
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP5
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP6
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP7
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP4
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP5
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP6
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP7
2.3.21.1-150200.76.1
fixed
dovecot23-fts-solr
suse enterprise sap 15 SP4
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP5
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP6
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP7
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP4
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP5
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP6
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP7
2.3.21.1-150200.76.1
fixed
dovecot23-fts-squat
suse enterprise sap 15 SP4
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP5
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP6
2.3.21.1-150200.76.1
fixed
suse enterprise sap 15 SP7
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP4
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP5
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP6
2.3.21.1-150200.76.1
fixed
suse enterprise server 15 SP7
2.3.21.1-150200.76.1
fixed
Common Weakness Enumeration
References
https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json