CVE-2026-42006
MEDIUM EPSS 22.4%
Published May 12, 20261mo ago · Modified Jun 17, 20262w ago
4.3 CVSS 3.1
Published May 12, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago
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 Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability Low
Threat Intelligence
EPSS Exploit Probability
22.4% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-400 Uncontrolled Resource Consumption Resource Mgmt
Affected Products 2
| Vendor | Product | Version | Range |
|---|---|---|---|
| dovecot | dovecot | * | <2.4.4 |
| open-xchange | dovecot | * | <3.1.5 |
References 1
- documentation.open-xchange.com https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0002.json
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.