CVE-2026-27858
HIGH
NVD
CVSS Score
7.5
Severity
HIGH
Published
Mar 27, 2026
Vendor
unknown
Description
Attacker can send a specifically crafted message before authentication that causes managesieve to allocate large amount of memory. Attacker can force managesieve-login to be unavailable by repeatedly crashing the process. Protect access to managesieve protocol, or install fixed version. No publicly available exploits are known.