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CVE-2026-42006

Published: May 12, 2026Updated: May 18, 2026 Sources: CVE List NVDCWE-400
NVD MITRE
4.3CVSSMEDIUM
EPSS Score
0.3%
Top 76.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low
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Weaknesses

CWE-400

Affected Products

OX Dovecot ProOpen-Xchange GmbH
On-prem
Enterprise Software / collaboration-groupware
dovecotdovecot
On-premWeb App
Communications / email-server-client
dovecotopen-xchangeCommunications
open-xchange gmbhcommercialDEEnterprise Softwareaka open-xchange
dovecotoss-projectCommunicationsaka dovecot, pigeonhole
open-xchangecommercialDECommunicationsaka open-xchange gmbh, ox

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0002.json
documentation.open-xchange.com

Timeline

Published
May 12, 2026
Last Updated
May 18, 2026

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