CVE-2026-27859
MEDIUM EPSS 29.3%
Published Mar 27, 20263mo ago · Modified Jun 17, 20262w ago
5.3 CVSS 3.1
Published Mar 27, 2026 3mo ago
Last Modified Jun 17, 2026 2w ago
Description
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability Low
Threat Intelligence
EPSS Exploit Probability
29.3% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-400 Uncontrolled Resource Consumption Resource Mgmt
Affected Products 3
| Vendor | Product | Version | Range |
|---|---|---|---|
| dovecot | dovecot | * | <2.4.3 |
| open-xchange | dovecot | * | <3.0.5 |
| open-xchange | dovecot | * | ≥3.1.0 – <3.1.4 |
References 1
- documentation.open-xchange.com https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.