High severity7.5NVD Advisory· Published Mar 27, 2026· Updated Jul 15, 2026
CVE-2026-27858
CVE-2026-27858
Description
Attacker can send a specifically crafted message before authentication that causes managesieve to allocate large amount of memory. Attacker can force managesieve-login to be unavailable by repeatedly crashing the process. Protect access to managesieve protocol, or install fixed version. No publicly available exploits are known.
Affected products
12- osv-coords9 versionspkg:rpm/almalinux/dovecotpkg:rpm/almalinux/dovecot-develpkg:rpm/almalinux/dovecot-mysqlpkg:rpm/almalinux/dovecot-pgsqlpkg:rpm/almalinux/dovecot-pigeonholepkg:rpm/opensuse/dovecot24&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/dovecot24&distro=openSUSE%20Tumbleweedpkg:rpm/suse/dovecot24&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/dovecot24&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0
< 1:2.3.21-16.el10_1.1+ 8 more
- (no CPE)range: < 1:2.3.21-16.el10_1.1
- (no CPE)range: < 1:2.3.21-16.el10_1.1
- (no CPE)range: < 1:2.3.21-16.el10_1.1
- (no CPE)range: < 1:2.3.21-16.el10_1.1
- (no CPE)range: < 1:2.3.21-16.el10_1.1
- (no CPE)range: < 2.4.3-160000.1.1
- (no CPE)range: < 2.4.3-1.1
- (no CPE)range: < 2.4.3-160000.1.1
- (no CPE)range: < 2.4.3-160000.1.1
Patches
Vulnerability mechanics
References
18- documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.jsonnvdVendor Advisory
- access.redhat.com/errata/RHSA-2026:13498nvd
- access.redhat.com/errata/RHSA-2026:13830nvd
- access.redhat.com/errata/RHSA-2026:13857nvd
- access.redhat.com/errata/RHSA-2026:17602nvd
- access.redhat.com/errata/RHSA-2026:17625nvd
- access.redhat.com/errata/RHSA-2026:17626nvd
- access.redhat.com/errata/RHSA-2026:17628nvd
- access.redhat.com/errata/RHSA-2026:17630nvd
- access.redhat.com/errata/RHSA-2026:18053nvd
- access.redhat.com/errata/RHSA-2026:19149nvd
- access.redhat.com/errata/RHSA-2026:19364nvd
- access.redhat.com/errata/RHSA-2026:19453nvd
- access.redhat.com/errata/RHSA-2026:19455nvd
- access.redhat.com/errata/RHSA-2026:26564nvd
- access.redhat.com/security/cve/CVE-2026-27858nvd
- bugzilla.redhat.com/show_bug.cginvd
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27858.jsonnvd
News mentions
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