CVE Catalog

CVE-2026-27859

MediumCVSS 5.3
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.38%

32th percentile - higher than 32% of all known CVEs

Summary

A mail message containing an excessive amount of RFC 2231 MIME parameters causes LMTP to use too much CPU. A suitably formatted mail message causes the mail delivery process to consume large amounts of CPU time.

Risk Assessment

An attacker could send a specially crafted message, causing CPU resource exhaustion and disruption of mail delivery.

Recommendation

Use MTA capabilities to limit RFC 2231 MIME parameters in mail messages, or upgrade to a fixed version where the processing is limited.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS