Medium severity4.3NVD Advisory· Published May 12, 2026· Updated Aug 3, 2026
CVE-2026-42006
CVE-2026-42006
Description
An attacker can cause uncontrolled memory usage with excessive bracing over IMAP. The fix in CVE-2026-27857 was incomplete, only blocking one way of doing this, so there was still another way left open. In particular, the fix was for closing braces, but you could still use open braces to bypass the limit. Using excessive bracing, attacker can cause memory usage up to configured memory limit. Install fixed version, or configure vsz_limit for imap process to low value. No publicly available exploits are known.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
13cpe:2.3:a:open-xchange:dovecot:*:*:*:*:pro:*:*:*+ 1 more
- cpe:2.3:a:open-xchange:dovecot:*:*:*:*:pro:*:*:*range: <3.1.5
- (no CPE)
- 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
< 1:2.3.16-18.el9_8.1+ 8 more
- (no CPE)range: < 1:2.3.16-18.el9_8.1
- (no CPE)range: < 1:2.3.16-18.el9_8.1
- (no CPE)range: < 1:2.3.16-18.el9_8.1
- (no CPE)range: < 1:2.3.16-18.el9_8.1
- (no CPE)range: < 1:2.3.16-18.el9_8.1
- (no CPE)range: < 2.4.4-160000.1.1
- (no CPE)range: < 2.4.4-1.1
- (no CPE)range: < 2.4.4-160000.1.1
- (no CPE)range: < 2.4.4-160000.1.1
Patches
Vulnerability mechanics
References
15- documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0002.jsonnvdIssue Tracking
- access.redhat.com/errata/RHSA-2026:41905nvd
- access.redhat.com/errata/RHSA-2026:41988nvd
- access.redhat.com/errata/RHSA-2026:42091nvd
- access.redhat.com/errata/RHSA-2026:44355nvd
- access.redhat.com/errata/RHSA-2026:44357nvd
- access.redhat.com/errata/RHSA-2026:44373nvd
- access.redhat.com/errata/RHSA-2026:46379nvd
- access.redhat.com/errata/RHSA-2026:46380nvd
- access.redhat.com/errata/RHSA-2026:46381nvd
- access.redhat.com/errata/RHSA-2026:46532nvd
- access.redhat.com/errata/RHSA-2026:49513nvd
- access.redhat.com/security/cve/CVE-2026-42006nvd
- bugzilla.redhat.com/show_bug.cginvd
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42006.jsonnvd
News mentions
0No linked articles in our index yet.